Real-Time Adaptive Sensing of Nuclear Spins by a Single-Spin Quantum Sensor

Wang, Jingcheng; Li, Dongxiao; Betzholz, Ralf; Cai, Jianming

doi:10.1103/physrevapplied.18.024040

Phys. Rev. Applied

2022

DOI: 10.1103/physrevapplied.18.024040

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Real-Time Adaptive Sensing of Nuclear Spins by a Single-Spin Quantum Sensor

Jingcheng Wang

Dongxiao Li

Ralf Betzholz

et al.

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2024

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Cited by 2 publications

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Identifiability and characterization of transmon qutrits through Bayesian experimental design

Reddy

2024

Journal of Applied Physics

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Robust control of a quantum system is essential to utilize the current noisy quantum hardware to its full potential, such as quantum algorithms. To achieve such a goal, a systematic search for an optimal control for any given experiment is essential. The design of optimal control pulses requires accurate numerical models and, therefore, accurate characterization of the system parameters. We present an online Bayesian approach for quantum characterization of qutrit systems, which automatically and systematically identifies optimal experiments that provide maximum information on the system parameters, thereby greatly reducing the number of experiments that need to be performed on the quantum testbed. Unlike most characterization protocols that provide point-estimates of the parameters, the proposed approach is able to estimate their probability distribution. The applicability of the Bayesian experimental design technique was demonstrated on test problems, where each experiment was defined by a parameterized control pulse. In addition to this, we also present an approach for iterative pulse extension, which is robust under uncertainties in transition frequencies and coherence times, and shot noise, despite being initialized with wide uninformative priors. Furthermore, we provide a mathematical proof of the theoretical identifiability of the model parameters and present conditions on the quantum state under which the parameters are identifiable. The proof and conditions for identifiability are presented for both closed and open quantum systems using the Schrödinger equation and the Lindblad master equation, respectively.

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Identifiability and characterization of transmon qutrits through Bayesian experimental design

Reddy

2024

Journal of Applied Physics

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How coherence measurements of a qubit steer its quantum environment

Qiu,

Jin,

Zhang

et al. 2024

Phys. Rev. B

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Real-Time Adaptive Sensing of Nuclear Spins by a Single-Spin Quantum Sensor

Cited by 2 publications

References 62 publications

Identifiability and characterization of transmon qutrits through Bayesian experimental design

Identifiability and characterization of transmon qutrits through Bayesian experimental design

How coherence measurements of a qubit steer its quantum environment

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