Research output
Publications
A complete list of my quantum research publications is provided below. My publication record is also available on Google Scholar and ORCID. Published papers link to publisher PDFs and use journal citation details. Preprints are clearly marked and link to their arXiv versions. You can also download the complete BibTeX file.
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2026
Geometric construction of optimal probe states in distributed multiparameter quantum sensing
arXiv preprint, arXiv:2609.26608 (2026)
We construct optimal probes for distributed multiparameter sensing from the geometry of joint generator eigenvalues, using enclosing balls for maximal total quantum Fisher information and optimized enclosing ellipsoids for minimum weighted covariance. The construction uses pure probes for local unitary estimation with commuting generators, with positive-definite weights for the weighted-covariance result.
Preprint v1, submitted to arXiv on 22 September 2026. The PDF link opens this version.
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2026
Minimal Trade-Off and Optimal Measurement for Multiparameter Quantum Estimation
Physical Review Letters, 137(2), 020804 (2026)
We derive a tight analytical bound on multiparameter Fisher information and construct optimal measurements, including a refined Arthurs-Kelly relation for simultaneous range and velocity estimation with entangled photons. The bound is attainable for locally identifiable pure-state models, while the radar result assumes Gaussian biphotons and ideal, noiseless reflection.
Companion Letter to Phys. Rev. A 114, 012609 (2026), which provides extended derivations, examples, and superconducting-processor demonstrations.
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2026
Tight trade-off relation and optimal measurement for multiparameter quantum estimation
Physical Review A, 114(1), 012609 (2026)
We provide detailed derivations and explicit constructions of optimal separable measurements, with worked examples for squeezed coherent states, quantum radar, and implementations on a superconducting quantum processor. Optimality concerns local Fisher information for pure-state models with nonsingular quantum Fisher information matrices, and the mixed-state extensions are generally not tight.
Extended companion to Phys. Rev. Lett. 137, 020804 (2026). Both papers contain the central pure-state bound and optimal-measurement construction.
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2024
Quantum Metrology Enhanced by Leveraging Informative Noise with Error Correction
Physical Review Letters, 133(19), 190801 (2024)
We establish when parameter-dependent Markovian noise permits Heisenberg scaling and construct adaptive error-correction protocols that retain its information, allowing precision to exceed the corresponding noiseless benchmark in explicit field-estimation models. The theory concerns single-parameter estimation with fast, ancilla-assisted error correction, and evaluates attainability as adaptive estimates approach the true parameter.
The PDF is the published PRL version. An earlier manuscript circulated under the title ‘Fluctuation-enhanced quantum metrology’.
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2024
npj Quantum Information, 10(1), 98 (2024)
We derive analytical and semidefinite-programming bounds on the errors of jointly approximating multiple observables, connect them to multiparameter precision trade-offs, and test the measurement relations on a superconducting quantum processor. These are state-dependent relations for any finite set of observables, with the semidefinite-programming bound exact for pure states but generally not for mixed states.
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2022
Information Geometry under Hierarchical Quantum Measurement
Physical Review Letters, 128(25), 250502 (2022)
We bound the loss of Fisher information when measurements act collectively on only a limited number of copies, connecting quantum information geometry to precision trade-offs in multiparameter estimation. The framework covers pure and mixed states under p-local measurements, which jointly measure at most p copies at a time.
Companion paper to Phys. Rev. A 105, 062442 (2022).
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2022
Physical Review A, 105(6), 062442 (2022)
We develop hierarchical precision bounds and a necessary condition for saturating the quantum Cramér-Rao bound, connecting partial commutativity for single-copy measurements to weak commutativity in the collective-measurement limit. The bounds cover pure and mixed states with nonsingular quantum Fisher information matrices and restricted collective measurements, but are not generally tight.
Companion paper to Phys. Rev. Lett. 128, 250502 (2022).
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2022
Optimal Scheme for Quantum Metrology
Advanced Quantum Technologies, 5(1), 2100080 (2022)
This review brings together analytical and numerical methods for optimizing probe states, parameter-encoding dynamics, and measurements, including quantum control, error correction, and adaptive readout. Its main focus is single-parameter quantum estimation in the asymptotic regime, rather than a general solution to finite-data or multiparameter optimization.
The publisher-formatted PDF carries a 2021 date. The journal citation is Advanced Quantum Technologies 5(1), 2100080 (2022).
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2021
Physical Review Letters, 126(7), 070503 (2021)
We construct and optically demonstrate a controlled protocol for jointly estimating a rotating field's amplitude and frequency, with standard deviations scaling respectively as T⁻¹ and T⁻². The bounds concern local estimation in a time-dependent unitary model with an ancilla and ideal control, approximated experimentally by five discrete controls.
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2021
Science Advances, 7(1), eabd2986 (2021)
We connect simultaneous optimal estimation to saturating multiple uncertainty relations and demonstrate an ancilla-assisted photonic multipass protocol approaching the individual precision limits of all three SU(2) parameters. Zero trade-off is established for ideal sequential unitary estimation with optimal adaptive controls, rather than for arbitrary quantum states or uncontrolled parallel probes.
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2020
Physical Review Letters, 125(2), 020501 (2020)
We derive a bound on the weighted sum of estimation variances for all three components of a magnetic field and construct entangled probes that attain the bound, quantifying trade-offs caused by incompatible optimal probe states. The result concerns local estimation with parallel, noiseless spin probes and no intermediate control, with exact ancilla-assisted attainment for sufficiently large probe resources.
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2019
Optimal joint estimation of multiple Rabi frequencies
Physical Review A, 99(3), 032122 (2019)
We identify optimal probes and measurements for jointly estimating two Rabi frequencies, show when joint estimation loses its advantage, and recover an advantage for multiple frequencies with adaptive control. The analysis concerns resonant, noiseless multilevel systems and local estimation, with matched evolution time and trial number and asymptotically optimal adaptive control.