About me

Current directions

Research

Recent activity

Highlights

• Sep 2026

  Our new preprint develops a geometric construction of optimal probe states for distributed multiparameter quantum sensing.

• Jul 2026

  Our companion studies on tight precision trade-offs and constructive optimal measurements appeared in Physical Review Letters and Physical Review A.

• Nov 2024

  Our work showing how informative noise can become a metrological resource with error correction was published in Physical Review Letters.

• Oct 2024

  Our framework for simultaneously measuring multiple incompatible observables appeared in npj Quantum Information.

• Mar 2024

  I joined Shenzhen University as an Assistant Professor in the College of Physics and Optoelectronic Engineering.

Selected work

Recent work focuses on optimal probes for distributed sensing, 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.

^† Corresponding author

1. 2026

   Geometric construction of optimal probe states in distributed multiparameter quantum sensing

   Hongzhen Chen^† (corresponding author), Lingna Wang^† (corresponding author), and Haidong Yuan^† (corresponding author)

   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.

   Preprint PDF BibTeX Link

2. 2026

   Minimal Trade-Off and Optimal Measurement for Multiparameter Quantum Estimation

   Lingna Wang^† (corresponding author), Hongzhen Chen^† (corresponding author), and Haidong Yuan^† (corresponding author)

   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.

   PDF DOI BibTeX Link

3. 2024

   Quantum Metrology Enhanced by Leveraging Informative Noise with Error Correction

   Hongzhen Chen^† (corresponding author), Yu Chen^† (corresponding author), Jing Liu, Zibo Miao, and Haidong Yuan^† (corresponding author)

   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’.

   PDF DOI BibTeX Link

4. 2024

   Simultaneous measurement of multiple incompatible observables and tradeoff in multiparameter quantum estimation

   Hongzhen Chen^† (corresponding author), Lingna Wang^† (corresponding author), and Haidong Yuan^† (corresponding author)

   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.

   PDF DOI BibTeX Link

5. 2022

   Information Geometry under Hierarchical Quantum Measurement

   Hongzhen Chen, Yu Chen, and Haidong Yuan^† (corresponding author)

   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).

   PDF DOI BibTeX Link

Career and education

Academic path

Appointments and training that shaped my work in quantum estimation, measurement, and control.

Get in touch

Contact

Email

hzchen@outlook.com

Address

College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China
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