Profile
About me
I study the fundamental precision limits of multiparameter quantum estimation and develop quantum-control and error-correction strategies to approach them.
I am an assistant professor at the College of Physics and Optoelectronic Engineering, Shenzhen University. Before joining Shenzhen University, I was a Research Associate (postdoctoral) in the Quantum Control Lab at The Chinese University of Hong Kong.
My work sits at the intersection of quantum metrology, quantum information, and quantum control, with an emphasis on rigorous precision bounds and experimentally relevant protocols.
Current directions
Research
Multiparameter quantum estimation
What precision trade-offs remain when several parameters are encoded in the same quantum state? We connect attainable bounds with explicit measurement constructions for pure-state models, and study the limits imposed by incompatible optimal probes in parallel quantum magnetometry.
Related work: pure-state precision bounds, constructing optimal measurements, and parallel-probe magnetometry.
Quantum measurement and uncertainty
How accurately can one measurement approximate several noncommuting observables, and how much information is lost when collective measurements can access only a limited number of copies at a time? We study state-dependent measurement errors and their consequences for multiparameter estimation.
Related work: joint measurement errors, information loss under restricted measurements, and hierarchical precision bounds.
Quantum control and error correction
When can control or error correction preserve the information needed for precise sensing? We study adaptive protocols that recover joint-estimation advantages, approach simultaneous precision limits, and retain useful parameter information carried by Markovian noise.
Related work: controlled Rabi-frequency estimation, controlled qubit rotations, rotating-field sensing, informative noise and error correction, and an optimization review.
Recent activity
Highlights
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Jul 2026
Our companion studies on tight precision trade-offs and constructive optimal measurements appeared in Physical Review Letters and Physical Review A.
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Nov 2024
Our work showing how informative noise can become a metrological resource with error correction was published in Physical Review Letters.
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Oct 2024
Our framework for simultaneously measuring multiple incompatible observables appeared in npj Quantum Information.
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Mar 2024
I joined Shenzhen University as an Assistant Professor in the College of Physics and Optoelectronic Engineering.
Selected work
Selected publications
View all publicationsRecent work focuses on attainable precision trade-offs and constructive optimal measurements for multiparameter estimation. Related directions include incompatible observables, hierarchical measurements, and informative noise as a metrological resource.
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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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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).
Career and education
Academic path
Appointments and training that shaped my work in quantum estimation, measurement, and control.
Appointments
Assistant Professor
College of Physics and Optoelectronic Engineering, Shenzhen University
Research Associate (postdoctoral)
Quantum Control Lab, The Chinese University of Hong Kong
Advisor: Prof. Haidong Yuan
Education
Ph.D. in Mechanical and Automation Engineering
The Chinese University of Hong Kong
Thesis: Ultimate Precision for Quantum Enhanced Parameter Estimation · Supervisor: Prof. Haidong Yuan
B.Sc. in Physics
Nanjing University
Thesis: Quantum Metrology in a Spin-Magnetic Resonance System · Supervisor: Prof. Shengjun Wu
Get in touch
Contact
- hzchen@outlook.com
- Address
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College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
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