Bayesian optimization of collective readouts combining dipole and quadrupole operators enables sub-SQL sensitivity in frequency-disordered spin ensembles, recovering metrological advantage where conventional squeezing fails.
@informaq.bsky.social
@informaq.bsky.socialBayesian optimization of collective readouts combining dipole and quadrupole operators enables sub-SQL sensitivity in frequency-disordered spin ensembles, recovering metrological advantage where conventional squeezing fails.
@informaq.bsky.socialQuantum scrambling-integrated scheme achieves Heisenberg-limited precision measurement via saddle-point and separatrix dynamics, enabling practical quantum metrology across broader parameter ranges than criticality-enhanced protocols.
@informaq.bsky.socialDistributed quantum sensing using entangled SU(1,1) Perelomov coherent states achieves Heisenberg-limited phase measurement in networks of Mach-Zehnder interferometers, outperforming separable strategies with sensitivity gains up to N.
@informaq.bsky.socialDemonstrated coherent optical control of 1,265 ions in a 3D trapped-ion crystal, achieving 21.6ms coherence time and 32-fold improved frequency precision through broadband cooling of thousands of vibrational modes below single-phonon occupation.
@informaq.bsky.socialResearchers demonstrate squeezed light achieves super-exponential advantages over classical approaches in phase estimation under discrete phase randomization, with advantages persisting even under optical loss and thermal noise.
@informaq.bsky.socialAtomic clouds in detuned photonic cavities achieve ultra-sensitive quantum sensing by amplifying sub-shot-noise fluctuations over 100-fold while preserving phase information. Demonstrates non-perturbative quantum sensing independent of atomic structure.
@informaq.bsky.socialResearchers prove the Holevo bound's feasible region equals the intersection of β-logarithmic derivative quantum Fisher information matrix constraints, unifying single- and multiparameter quantum estimation limits.
@informaq.bsky.socialNew SDP bounds for sequential quantum sensing extend the Nagaoka-Hayashi framework to temporally correlated noise. Proves attainability for single-parameter problems and derives protocols achieving Heisenberg scaling in error-corrected quantum sensing.
@informaq.bsky.socialNovel quantum primitive achieves √n precision gain over classical majority voting by leveraging GHZ entanglement for phase estimation. Demonstrates Heisenberg-limited scaling on trapped-ion hardware with rigorous theoretical guarantees.
@informaq.bsky.socialQuantum metrology combined with error correction enables precise measurements for dark matter detection, gravitational waves, and atomic clocks. Perimeter researchers advance quantum sensing to push fundamental physics discovery.
@informaq.bsky.socialNovel measurement technique reads quantum state matrix elements exactly at arbitrary times by comparing unknown states against known references. Robust against dephasing and amplitude damping with no knowledge of energy levels required.
@informaq.bsky.socialProves determining whether quantum parameter estimation can achieve fundamental precision limits is computationally intractable (NP-hard), revealing a fundamental obstruction explaining 60+ years of unsolved quantum metrology challenges.
@informaq.bsky.socialDemonstrates that collective two-copy quantum measurements attain the Holevo precision bound for multi-parameter estimation, disproving universal finite-copy gap persistence and revealing structural conditions enabling quantum measurement superiority.
@informaq.bsky.socialNovel protocol achieves sublinear sample complexity o(d^0.9908/ε²) for quantum fidelity estimation using Pauli basis measurements, breaking the previous linear barrier and advancing practical quantum state verification methods.
@informaq.bsky.socialDisorder in the Kitaev toric code can enhance quantum Fisher information for parameter sensing, enabling transient quartic scaling in metrological precision. Shows imperfections can constructively improve quantum sensing with topological systems.
@informaq.bsky.socialQuantum-enhanced frequency sensing persists to arbitrarily long measurement times by combining Fock-state enhancement with quantum heterodyne protocol, achieving fractional precision ~6×10^-15 on trapped ions with 7.1 dB quantum advantage.
@informaq.bsky.socialMankei Tsang proposes a practical measurement scheme using bosonic ancillas to approach the Holevo-Nagaoka bound, advancing quantum metrology from theory to implementable experiments with optimal sensing precision.
@informaq.bsky.socialEstablishes fundamental limits for simultaneous quantum estimation of magnetic field components across three metrological settings, deriving tight bounds and optimal configurations for vector magnetometry.
@informaq.bsky.socialNovel time-array measurement protocol stabilizes quadratic temporal scaling of quantum sensing precision even with sub-optimal measurements, validated through Bayesian estimation across three paradigmatic quantum systems.
@informaq.bsky.socialWe demonstrate training programmable optical sensing systems using natural parameter fluctuations, eliminating need for response models or controlled parameter scans. The method achieves quantum-limited measurement precision for two-source imaging.