Phys Rev Lett
· 2026 Jun · PMID 42360976
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Directly probing light-quark Yukawa couplings and their flavor structure remains a major challenge due to their smallness and overwhelming QCD backgrounds. In this Letter, we propose a theoretical framework to access the...Directly probing light-quark Yukawa couplings and their flavor structure remains a major challenge due to their smallness and overwhelming QCD backgrounds. In this Letter, we propose a theoretical framework to access these couplings at lepton colliders through transverse spin dependent azimuthal modulations in dihadron fragmentation. These modulations arise from the interference between Higgs mediated and standard model amplitudes in e^{-}e^{+}→qq[over ¯]Z, producing angular structures that are linearly sensitive to the Yukawa couplings y_{q}, in contrast to conventional observables that scale as y_{q}^{2}. By combining channels with an identified accompanying single hadron, h^{'}=π^{±},K^{±}, and p/p[over ¯], this approach cleanly disentangles the up- and down-quark Yukawa contributions, yielding typical limits at the O(10^{-4}-10^{-3}) level and establishing fragmentation dynamics as a novel and complementary probe of the Higgs flavor structure.
Yu YT, Lee HL, Chung SH
… +4 more, Hsu T, Lin GD, Chen YC, Jen HH
Phys Rev Lett
· 2026 Jun · PMID 42360975
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Fast coherent state transport is essential to quantum computation and quantum information processing. While an adiabatic transport of atomic qubits guarantees a high fidelity of the state preparation, it requires a long...Fast coherent state transport is essential to quantum computation and quantum information processing. While an adiabatic transport of atomic qubits guarantees a high fidelity of the state preparation, it requires a long timescale that defies efficient quantum operations. Here, we propose an adaptable and fast bang-bang-bang protocol, utilizing a combination of forward- and backward-moving trap potentials, to expedite the coherent state transport. We further showcase the advantage of applying squeezed coherent state evolution under a deeper potential followed by a weaker one, where a design of symmetric squeezing potential transports promotes an even shorter timescale for genuine state preparation. Our protocols outperform conventional forward-moving-only methods, providing new insights and opportunities for rapid state transport and preparation, ultimately advancing the capabilities of quantum control and quantum operations.
Kasai K, Uematsu A, Wang Y
… +4 more, Xu T, Liu C, Minami S, Shimada T
Phys Rev Lett
· 2026 Jun · PMID 42360974
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Magnetic and polar skyrmions exhibit topologically protected quasiparticle behavior, including emergent fields, deformation, and the formation of a densely packed skyrmion lattice, beyond conventional domain configuratio...Magnetic and polar skyrmions exhibit topologically protected quasiparticle behavior, including emergent fields, deformation, and the formation of a densely packed skyrmion lattice, beyond conventional domain configurations described by Kittel's law. Analogous to atomic crystals, lattice defects, especially dislocations and their associated strain fields are crucial for understanding the lattice behavior of skyrmions; however, their features and roles remain insufficiently understood. Here, we show that magnetic skyrmion dislocations develop a core-split structure due to a significant skyrmion elongation up to 180% of their original length, reaching a topological transition from a single skyrmion to two half-skyrmions. Despite such a distinct structure, the long-range strain fields around the dislocation perfectly obey conventional Volterra's elasticity theory, in contrast to polar skyrmion lattices, where skyrmion deformations cause a breakdown of the elasticity theory. Furthermore, an energetic analysis shows that Dzyaloshinskii-Moriya interaction drives the large skyrmion deformation of the dislocation core. Our findings not only clarify the coexistence of topological core reconstruction and a robust long-range elastic field of dislocations in magnetic skyrmion lattices, but also reveal that magnetic and electric domains, long regarded as analogous, exhibit fundamental differences when extended into the regime of collective topological quasiparticles.
Phys Rev Lett
· 2026 Jun · PMID 42360973
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Scaling quantum computers to large sizes requires the implementation of many parallel qubit readouts. Here we present an ultrastable superconducting-qubit readout method using the multitone self-phase-referenced Pound-Dr...Scaling quantum computers to large sizes requires the implementation of many parallel qubit readouts. Here we present an ultrastable superconducting-qubit readout method using the multitone self-phase-referenced Pound-Drever-Hall (PDH) technique, originally developed for use with optical cavities. In this work, we benchmark PDH readout of a single transmon qubit, using room-temperature heterodyne detection of all tones to reconstruct the PDH signal. We demonstrate that PDH qubit readout is insensitive to microwave phase drift, displaying 0.73° phase stability over 2 hours, and capable of single-shot readout in the presence of phase errors exceeding the phase shift induced by the qubit state. We show that the PDH sideband tones do not cause unwanted measurement-induced state transitions for a transmon qubit, leading to a potential signal enhancement of at least 14 dB.
Steinacker P, Goenka G, Su RY
… +17 more, Tanttu T, Lim WH, Serrano S, Botzem T, Cifuentes JD, Lim SQ, McCallum JC, Johnson BC, Hudson FE, Chan KW, Escott CC, Saraiva A, Yang CH, Mourik V, Morello A, Dzurak AS, Laucht A
Phys Rev Lett
· 2026 Jun · PMID 42360972
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Single nuclear spins in silicon are a promising resource for quantum technologies due to their long coherence times and excellent control fidelities. Qubits and qudits have been encoded on donor nuclei, with successful d...Single nuclear spins in silicon are a promising resource for quantum technologies due to their long coherence times and excellent control fidelities. Qubits and qudits have been encoded on donor nuclei, with successful demonstrations of Bell states and quantum memories on the spin-^{1}/_{2} ^{31}P and cat-qubits on the spin-^{7}/_{2} ^{123}Sb nuclei. Isoelectronic nuclear spins coupled to gate-defined quantum dots, such as the naturally occurring ^{29}Si isotope, possess no additional charge and allow for the coupled electron to be shuttled without destroying the nuclear spin coherence. Here, we demonstrate the coupling of a spin-^{9}/_{2} ^{73}Ge nuclear spin to a gate-defined quantum dot in SiMOS via Pauli spin blockade readout using rf reflectometry. We observe the hyperfine interaction (HFI) to the coupled quantum dot electron and are able to tune it from 180 to 350 kHz, through the voltages applied to the lateral gate electrodes. This smaller HFI combined with the faster readout enable easier quantum nondemolition readout of the nuclear spin state. Thus, this work lays the foundation for future spin control experiments on the spin-^{9}/_{2} qudit as well as more advanced experiments such as entanglement distribution between distant nuclear spins or repeated weak measurements.
Yu XM, Deng X, Zheng W
… +15 more, Xin W, Zhang T, Che H, Zhou K, Zhou H, Ge Y, Zhang Z, Huang W, Cai H, Li X, Zhao J, Tan X, Zhang Y, Li SX, Yu Y
Phys Rev Lett
· 2026 Jun · PMID 42360971
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Qutrits offer the potential for enhanced quantum computation by exploiting an enlarged Hilbert space. However, the synthesis of high-fidelity and fast qutrit gates, particularly for single qutrits, remains an ongoing cha...Qutrits offer the potential for enhanced quantum computation by exploiting an enlarged Hilbert space. However, the synthesis of high-fidelity and fast qutrit gates, particularly for single qutrits, remains an ongoing challenge, as it involves overcoming intrinsic constraints in quantum platforms. Here, we develop a novel framework for the efficient implementation of a single-qutrit gate set via coherent control, leveraging SU(3) dynamics while obviating platform-specific constraints such as those arising from the selection rule. As a proof-of-principle demonstration, we realize 35-ns qutrit hadamard and x gates using a superconducting transmon, achieving an average fidelity of 99.5%, as verified by randomized benchmarking. We further demonstrate two paradigmatic quantum circuits, which can be naturally extended to scalable qudit algorithms for phase estimation and parity check. In addition, we propose an SU(3)-based decomposition strategy for an arbitrary single-qutrit gate and numerically demonstrate its substantial efficiency improvement over conventional SU(2)-based protocols. By addressing the challenge of efficiently implementing single-qutrit gates, our protocol paves the way for realizing high-performance qutrit processors in diverse quantum platforms.
Kiorpelidis I, Heinrich M, Szameit A
… +2 more, Siviloglou GA, Makris KG
Phys Rev Lett
· 2026 Jun · PMID 42360970
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We present exact analogies between the tautochrone problem of classical mechanics and the squeezed states of quantum optics to optical lattices. Both phenomena emerge in the same physical system, that of waveguide arrays...We present exact analogies between the tautochrone problem of classical mechanics and the squeezed states of quantum optics to optical lattices. Both phenomena emerge in the same physical system, that of waveguide arrays with nonuniform couplings. Extension to two dimensions yields Lissajous-type trajectories and multidirectional tautochrone focusing. Furthermore, we investigate the impact of Kerr nonlinearity and show that it determines the diffraction behavior, namely coherent-state-like or squeezed propagation. These quantum inspired classical lattices highlight the role of the coupling coefficients to beam engineering and light control in complex media.
Liu Z, Kikuchi H, Wei Z
… +8 more, Asai S, Enderle M, Hansen UB, Garlea VO, Le MD, Nilsen GJ, Zaliznyak IA, Masuda T
Phys Rev Lett
· 2026 Jun · PMID 42360969
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Chiral magnons, the quanta of handed spin waves, transport spin angular momentum without energy loss due to Joule heating. The recently discovered altermagnets were proposed to host chiral magnons arising from a nonrelat...Chiral magnons, the quanta of handed spin waves, transport spin angular momentum without energy loss due to Joule heating. The recently discovered altermagnets were proposed to host chiral magnons arising from a nonrelativistic exchange mechanism, similar to that in ferromagnets but without net magnetization, offering a stray-field-free platform for efficient magnon spin-current manipulation. In this Letter, we directly observed chiral magnons in the altermagnetic prototype MnTe using polarized inelastic neutron scattering. Furthermore, the magnon chirality was found to be reversibly switched by magnetic-field control, establishing a robust foundation for functional altermagnetic magnonics.
Xu ZX, Dai W, Zhang BW
… +2 more, Zhao J, Zhuang P
Phys Rev Lett
· 2026 Jun · PMID 42360968
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Heavy flavor production serves as an ideal probe of the hadronization mechanism of the quark-gluon plasma created in relativistic heavy ion collisions. We study charm-quark hadronization using Langevin transport in the m...Heavy flavor production serves as an ideal probe of the hadronization mechanism of the quark-gluon plasma created in relativistic heavy ion collisions. We study charm-quark hadronization using Langevin transport in the medium together with a sequential coalescence model. Since D_{s} forms earlier than D^{0}, as obtained from the Dirac equation with an in-medium potential extracted from lattice QCD, the D_{s} elliptic flow v_{2} is smaller than the D^{0} v_{2} in the intermediate-p_{T} region, in good agreement with the recent ALICE data. Incorporating sequential coalescence, charm-quark number conservation, and strangeness enhancement predicts a peak in the yield ratio D_{s}/D^{0} at low p_{T}, which can be tested in future heavy-ion collisions.
Schué L, Pistawala N, Elnaggar H
… +8 more, Klein Y, Bellin C, Biscaras J, Sirotti F, Lassailly Y, Cadiz F, Harnagea L, Shukla A
Phys Rev Lett
· 2026 Jun · PMID 42360967
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Layered magnetic materials provide the opportunity for fundamental investigations of magnetism in the two-dimensional limit. NiPS_{3}, a prototype member of this family, is antiferromagnetic below 155 K and exhibits shar...Layered magnetic materials provide the opportunity for fundamental investigations of magnetism in the two-dimensional limit. NiPS_{3}, a prototype member of this family, is antiferromagnetic below 155 K and exhibits sharp photoluminescence associated with a transition between a triplet ground state and a singlet excited state. The nature of the luminescent transition is a matter of current debate and so is an eventual fundamental link of this excitation to magnetism. We synthesize samples with metal and ligand substitutions altering the Néel transition temperature and measure the effects of these changes on temperature dependent photoluminescence. We perform crystal field and charge transfer multiplet calculations to explain the origin of the excitation and identify it as spin flip luminescence originating in Ni crystal field levels. Through observations of phonon side bands we confirm that it is localized at the Ni site as opposed to a possible coherent delocalized excitation between hybridized Zhang-Rice states. Alloying with Zn and Se shows a lack of correlation between the temperature dependence of the luminescence and the Néel temperature, belying its supposedly magnetic nature.
Jiang C, Yang F, Zhao Y
… +15 more, Yang J, Yu P, Liu H, Zhang Y, Jia Z, Cao X, Tian L, Yan J, Liu Z, Liu Z, Sheng XL, Xiao C, Yang SA, Dong S, Xiu F
Phys Rev Lett
· 2026 Jun · PMID 42360966
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Intrinsic responses are of paramount importance in physics research, as they represent the inherent properties of materials, independent of extrinsic factors that vary from sample to sample, and often reveal the intrigui...Intrinsic responses are of paramount importance in physics research, as they represent the inherent properties of materials, independent of extrinsic factors that vary from sample to sample, and often reveal the intriguing quantum geometry of the band structure. Here, we report the experimental discovery of a new intrinsic response in charge transport, specifically the intrinsic nonlinear planar Hall effect, in the topological semimetal TaIrTe_{4}. This effect is characterized by an induced Hall current that is quadratic in the driving electric field and linear in the in-plane magnetic field. The response coefficient is determined by the susceptibility tensor of the Berry-connection polarizability dipole, which is an intrinsic band geometric quantity. Remarkably, the signal persists up to room temperature. Our theoretical calculations show excellent agreement with the experimental results and further elucidate the significance of a previously unknown orbital mechanism in intrinsic nonlinear planar Hall effect. This finding not only establishes a novel intrinsic material property but also opens a new route toward innovative nonlinear devices capable of operating at room temperature.
Phys Rev Lett
· 2026 Jun · PMID 42360965
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We study the capacity of a quantum channel for retrocausal communication, where messages are transmitted backward in time, from a sender in the future to a receiver in the past, through a noisy postselected closed timeli...We study the capacity of a quantum channel for retrocausal communication, where messages are transmitted backward in time, from a sender in the future to a receiver in the past, through a noisy postselected closed timelike curve mathematically represented by the channel. We completely characterize the one-shot retrocausal quantum and classical capacities, and we show that the corresponding asymptotic capacities are equal to the average and sum, respectively, of the channel's max-information and its regularized Doeblin information. This endows these information measures with a novel operational interpretation. Furthermore, our characterization can be generalized beyond quantum channels to all completely positive maps. This imposes information-theoretic limits on transmitting messages via postselected-teleportation-like mechanisms with arbitrary initial- and final-state boundary conditions, including those considered in various black-hole final-state models.
Hu M, Zhang C, Zhang D
… +3 more, Sun Y, Deng Y, Lv JP
Phys Rev Lett
· 2026 Jun · PMID 42360964
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The phase of spins in the quasi-two-dimensional (q2D) XY model has emerged as a topic of significant interest across multiple subfields of physics. Conventional wisdom, rooted in the Mermin-Wagner theorem and supported b...The phase of spins in the quasi-two-dimensional (q2D) XY model has emerged as a topic of significant interest across multiple subfields of physics. Conventional wisdom, rooted in the Mermin-Wagner theorem and supported by existing paradigms, asserts that true long-range (LR) order is prohibited in q2D systems with continuous symmetries and short-range (SR) interactions. In this Letter, we propose a strictly SR q2D XY model defined on a plane perpendicularly intersected by a group of parallel planes, where each plane consists of XY spins coupled via nearest-neighbor interactions. Through large-scale Monte Carlo simulations complemented by finite-size scaling analysis, we establish the complete phase diagram of the setup. A LR ordered phase emerges in the q2D model when the spins on the parallel planes develop a Berezinskii-Kosterlitz-Thouless critical phase. The LR ordered phase is anisotropic: true LR correlations develop exclusively along the direction of the intersection lines, while the perpendicular direction exhibits quasi-long-range order. Furthermore, the LR order exhibits Goldstone-mode physics. Our findings reveal a mechanism for stabilizing LR order in low-dimensional systems with continuous symmetries, thereby establishing a new platform for studying exotic superfluidity.
Madurga M, Xu ZY, Grzywacz R
… +54 more, Mumpower MR, Andreyev AN, Benzoni G, Borge MJG, Costache C, Cox I, Cupp S, Dimitrov B, Van Duppen P, Fraile LM, Franchoo S, Fynbo H, Gonsalves B, Gottardo A, Greenless PT, Gross A, Gross CJ, Harkness-Brennan LJ, Huyse M, Judson DS, Kisyov S, Kolos K, Konki J, Kurcewicz J, Lazarus I, Lică R, Lynch L, Lund M, Marginean N, Marginean R, Mihai C, Marroquin I, Mazzocchi C, Mengoni D, Morales AI, Nacher E, Negret A, Page RD, Pascu S, Paulauskas SV, Perea A, Piersa-Siłkowska M, Pucknell V, Rahkila P, Rapisarda E, Rotaru F, Sotty C, Taylor S, Tengblad O, Vedia V, Verney D, Wadsworth R, Warr N, de Witte H
Phys Rev Lett
· 2026 Jun · PMID 42360963
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Using the time-of-flight technique, we measured the beta-delayed neutron emission of ^{132}Cd. From our large-scale shell model (LSSM) calculation using the N^{3}LO interaction [Z. Y. Xu et al., Phys. Rev. Lett. 131, 022...Using the time-of-flight technique, we measured the beta-delayed neutron emission of ^{132}Cd. From our large-scale shell model (LSSM) calculation using the N^{3}LO interaction [Z. Y. Xu et al., Phys. Rev. Lett. 131, 022501 (2023)PRLTAO0031-900710.1103/PhysRevLett.131.022501], we suggest the decay is dominated by the transformation of a neutron in the g_{7/2} orbital, deep below the Fermi surface, into a proton in the g_{9/2} orbital. We compare the beta-decay half-lives and neutron branching ratios of nuclei with Z<50 and N≥82 obtained with our LSSM with those of leading "global" models such as finite-range droplet model (FRDM). Our calculations match known half-lives and neutron branching ratios well and suggest that current leading models overestimate the yet-to-be-measured half-lives. Our model, backed by the ^{132}Cd decay data presented here, offers robust predictive power for nuclei of astrophysical interest such as r-process waiting points.
Hu Q, Tan Y, Cui Q
… +13 more, Huang Y, Zhu W, Zhang X, Wang Y, Wang Y, Qian X, Zhang J, Wei Z, You J, Ji Y, Zhao L, Xiong Q, Wang K
Phys Rev Lett
· 2026 Jun · PMID 42360962
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Spin-and-valley-tronics explores the spin and valley degree of freedom for power-efficient and high-speed information storage and processing. A critical challenge in advancing spin-and-valley-tronic devices toward quantu...Spin-and-valley-tronics explores the spin and valley degree of freedom for power-efficient and high-speed information storage and processing. A critical challenge in advancing spin-and-valley-tronic devices toward quantum operation lies in achieving coherent control over the spin and valley dynamics. A gigantic magnetic field is generally required to initiate fast coherent spin and valley precession to beat the subpicosecond valley decoherence in transition metal dichalcogenides. The magnetic proximity effect (MPE) can enhance the effective valley and spin magnetic moment, which has been explored extensively for engineering the magneto-optical properties of magnetic heterostructure. However, its influence on ultrafast coherent spin and valley dynamics remains unexplored. Herein, we investigate the MPE in WSe_{2}/CrSBr heterostructures, which feature resonantly aligned band structures that promote strong charge transfer (CT) with a noncollinear spin configuration. The valley Zeeman splitting and emission helicity of WSe_{2}/CrSBr are found substantially enhanced. We show that the enhanced exchange coupling together with noncollinear CT spin state drives subpicosecond coherent spin and valley precession, giving rise to anomalous magneto-optical properties. The anomalous MPE also leads to the observation of switchable exchange bias on the 2D ferromagnet with light helicity. Our work sheds light on the intriguing coherent spin and valley dynamics at the magnetic van der Waals interface and paves the way for ultrafast encoding and processing of coherent spin and valley information.
Phys Rev Lett
· 2026 Jun · PMID 42360961
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We study the spin-1/2 Kitaev honeycomb gapless spin liquid in the presence of Stone-Wales-type local lattice defects with odd-sided plaquettes. While the clean Kitaev model has no finite-temperature phase transitions, we...We study the spin-1/2 Kitaev honeycomb gapless spin liquid in the presence of Stone-Wales-type local lattice defects with odd-sided plaquettes. While the clean Kitaev model has no finite-temperature phase transitions, we find that introducing a finite defect density n_{d}≈10^{-4}-10^{-2} produces a true phase transition with a sizeable T_{c}≈2n_{d} in units of the Kitaev exchange. The resulting non-Abelian chiral quantum spin liquid exhibits scalar spin chirality and electron orbital magnetization which peak near lattice defects. This disorder-driven instability relies on an emergent long range ferromagnetic interaction r^{-γ} (γ≈2.7) between defect chiralities, mediated by the nearly gapless fermions, with implications for topology generation in Dirac cones with fluctuating mass terms.
Basset J, Stanisavljević O, Gabelli J
… +2 more, Aprili M, Estève J
Phys Rev Lett
· 2026 Jun · PMID 42360960
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We demonstrate a single-photon detector operating in the microwave domain, based on photoassisted quasiparticle tunneling events that poison a superconducting island. The detection relies on continuously monitoring the i...We demonstrate a single-photon detector operating in the microwave domain, based on photoassisted quasiparticle tunneling events that poison a superconducting island. The detection relies on continuously monitoring the island's charge parity using microwave reflectometry. This scheme achieves 10% detection efficiency with sub 50 ns time resolution and short dead time (∼1 μs), for microwave photons at 10 GHz. The detector features three junctions connected to a superconducting island, which together carry out photoelectric conversion and charge readout. The enhanced light-matter coupling, crucial to photon-to-quasiparticle conversion, is provided by a granular aluminum-based high-impedance microwave resonator. The time-resolved detection of itinerant microwave photon opens up new perspectives in quantum sensing, microwave quantum optics, and mesoscopic physics.
Phys Rev Lett
· 2026 Jun · PMID 42360959
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We predict an anomalous thermally activated superradiance in molecular aggregates within polaritonic environments. In contrast to free space, the collective emission is enhanced when either the exciton-phonon coupling or...We predict an anomalous thermally activated superradiance in molecular aggregates within polaritonic environments. In contrast to free space, the collective emission is enhanced when either the exciton-phonon coupling or the temperature increases. This counterintuitive phenomenon is captured by a microscopic theory that combines macroscopic quantum electrodynamics with a modified polaron quantum master equation approach, revealing a nontrivial interplay among excitons, phonons, and polaritons.
Zhang Y, Shapovalov K, He X
… +6 more, Liu C, Yong H, Zhang X, Wang J, Zhou K, Ghosez P
Phys Rev Lett
· 2026 Jun · PMID 42360958
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Although strain gradients hold great promise for tailoring emergent functionalities, their flexible global control remains a fundamental challenge. Here, we address this concern in PbTiO_{3} under biaxial tensile strain...Although strain gradients hold great promise for tailoring emergent functionalities, their flexible global control remains a fundamental challenge. Here, we address this concern in PbTiO_{3} under biaxial tensile strain by uncovering the spontaneous appearance of strain gradients and 90° ferroelectric domain walls and demonstrating their electric control. Combining symmetry analysis and first-principles calculations, we reveal hidden polar-acoustic instabilities within conventionally assumed ground states. We further demonstrate that the trilinear coupling among the modulated polar mode, acoustic mode with modulated strain, and uniform polar mode spontaneously stabilizes a lower-energy a_{1}/a_{2} 90° domain structure with Pmc2_{1} symmetry and intrinsic strain gradients. Remarkably, we discover similar polar-acoustic coupling that governs both the c/a domain patterns and their dramatic piezoelectric enhancement. Leveraging these strong lattice couplings, we develop a unified framework for describing and electrically switching spatially varying strain and polarization fields. Our Letter resolves long-standing cross-scale discrepancies in the strain phase diagrams of PbTiO_{3}, reveals a new phonon-mediated mechanism for giant piezoelectricity, and provides the atomistic foundation for the electrical control of strain gradients and domain walls.