A5049538567- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Thermodynamics and Statistical Mechanics
- Neural Networks and Reservoir Computing
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
Chinese University of Hong Kong
2021-2025
Quantum metrology can achieve far better precision than classical metrology, and is one of the most important applications quantum technologies in real world. To attain highest promised by all steps schemes need to be optimized, which include state preparation, parametrization, measurement. Here recent progresses on optimization these steps, are essential for identification achievement ultimate limit reviewed. It hoped this provides a useful reference researchers related fields.
<title>Abstract</title> Quantum metrology has emerged as a powerful tool for timekeeping, field sensing, and precision measurements within fundamental physics. With the advent of distributed quantum metrology, its capabilities have been extended to probing spatially parameters across networked systems. However, generating necessary non-local entanglement remains significant challenge, inherent incompatibility in multi-parameter estimation affects ultimate performance. Here we use...
Quantum control can be employed in quantum metrology to improve the precision limit for estimation of unknown parameters. The optimal control, however, typically depends on actual values parameters and thus needs designed adaptively with updated estimations those Traditional methods, such as gradient ascent pulse engineering (GRAPE), need rerun each new set encountered, making optimization costly, especially when many are involved. Here we study generalizability namely, controls that...
Abstract How well can multiple incompatible observables be implemented by a single measurement? This is fundamental problem in quantum mechanics with wide implications for the performance optimization of numerous tasks information science. While existing studies have been mostly focusing on approximation two measurement, practice are often encountered, which errors approximations little understood. Here we provide framework to study implementation an arbitrary finite number measurement. Our...
<title>Abstract</title> How well can multiple incompatible observables be implemented by a single measurement? This is fundamental problem in quantum mechanics with wide implications for the performance optimization of numerous tasks information science. While existing studies have been mostly focusing on approximation two measurement, practice are often encountered, which errors approximations little understood. Here we provide framework to study implementation an arbitrary finite number...
Quantum metrology has emerged as a powerful tool for timekeeping, field sensing, and precision measurements within fundamental physics. With the advent of distributed quantum metrology, its capabilities have been extended to probing spatially parameters across networked systems. However, generating necessary non-local entanglement remains significant challenge, inherent incompatibility in multi-parameter estimation affects ultimate performance. Here we use superconducting network with...
Previous studies in quantum information have recognized that specific types of noise can encode certain applications. However, the role Quantum Hypothesis Testing (QHT), traditionally assumed to undermine performance and reduce success probability, has not been thoroughly explored. Our study bridges this gap by establishing sufficient conditions for noisy dynamics surpass probabilities achievable under noiseless (unitary) within time intervals. We then devise experimentally implement a...
The laws of quantum physics place a limit on the speed computation. In particular, evolution time system from an initial state to final cannot be arbitrarily short. Bounds for unitary dynamics have long been studied. A few bounds noisy also obtained recently, which, however, are in general not tight. this paper, we present new framework concerning dynamics. Within obtain exact maximal rotation angle that can achieve at any given time, which gives rise tight bound clearly reveals essentially...
Squeezing a quantum state along specific direction has long been recognized as crucial technique for enhancing the precision of metrology by reducing parameter uncertainty. However, practical often involves simultaneous estimation multiple parameters, necessitating use high-quality squeezed states orthogonal axes to surpass standard limit all relevant parameters. In addition, temporally stabilized can provide an event-ready probe regardless initial state, and robust timing preparation...