256 citations · 967 across the 24 of their papers we have counts for
24 papers
Near-optimal quantum metrology with few-qubit measurements
Liang Mao, Senrui Chen, Hsin-Yuan Huang +2
Quantum metrology, which addresses parameter estimation in quantum systems, has broad applications across science and technology. Conventional metrology protocols for multi-qubit s…
Efficient learning of logical noise from syndrome data
Han Zheng, Chia-Tung Chu, Senrui Chen +4
Characterizing errors in quantum circuits is essential for device calibration, yet detecting rare error events requires a large number of samples. This challenge is particularly se…
Quantum learning advantage on a scalable photonic platform
Zheng-Hao Liu, Romain Brunel, Emil E. B. Østergaard +12
Recent advancements in quantum technologies have opened new horizons for exploring the physical world in ways once deemed impossible. Central to these breakthroughs is the concept…
Advancing quantum imaging through learning theory
Yunkai Wang, Changhun Oh, Junyu Liu +2
We study quantum imaging by applying the resolvable expressive capacity (REC) formalism developed for physical neural networks (PNNs). In this paradigm of quantum learning, the ima…
Entanglement-enabled advantage for learning a bosonic random displacement channel
Changhun Oh, Senrui Chen, Yat Wong +8
We show that quantum entanglement can provide an exponential advantage in learning properties of a bosonic continuous-variable (CV) system. The task we consider is estimating a pro…
Tight bounds on Pauli channel learning without entanglement
Senrui Chen, Changhun Oh, Sisi Zhou +2
Quantum entanglement is a crucial resource for learning properties from nature, but a precise characterization of its advantage can be challenging. In this work, we consider learni…
Achieving metrological limits using ancilla-free quantum error-correcting codes
Sisi Zhou, Argyris Giannisis Manes, Liang Jiang
Quantum error correction (QEC) is theoretically capable of achieving the ultimate estimation limits in noisy quantum metrology. However, existing quantum error-correcting codes des…
Optimal protocols for quantum metrology with noisy measurements
Sisi Zhou, Spyridon Michalakis, Tuvia Gefen
Measurement noise is a major source of noise in quantum metrology. Here, we explore preprocessing protocols that apply quantum controls to the quantum sensor state prior to the fin…
Shadow Distillation: Quantum Error Mitigation with Classical Shadows for Near-Term Quantum Processors
Alireza Seif, Ze-Pei Cian, Sisi Zhou +2
Mitigating errors in quantum information processing devices is especially important in the absence of fault tolerance. An effective method in suppressing state-preparation errors i…
Preparation of Metrological States in Dipolar-Interacting Spin Systems
Tian-Xing Zheng, Anran Li, Jude Rosen +7
Spin systems are an attractive candidate for quantum-enhanced metrology. Here we develop a variational method to generate metrological states in small dipolar-interacting ensembles…
Quantum error correction meets continuous symmetries: fundamental trade-offs and case studies
Zi-Wen Liu, Sisi Zhou
We systematically study the fundamental competition between quantum error correction (QEC) and continuous symmetries, two key notions in quantum information and physics, in a quant…
Quantum advantages for Pauli channel estimation
Senrui Chen, Sisi Zhou, Alireza Seif +1
We show that entangled measurements provide an exponential advantage in sample complexity for Pauli channel estimation, which is both a fundamental problem and a practically import…
Adaptive Circuit Learning for Quantum Metrology
Ziqi Ma, Pranav Gokhale, Tian-Xing Zheng +5
Quantum sensing is an important application of emerging quantum technologies. We explore whether a hybrid system of quantum sensors and quantum circuits can surpass the classical l…
Unboxing Quantum Black Box Models: Learning Non-Markovian Dynamics
Stefan Krastanov, Kade Head-Marsden, Sisi Zhou +3
Characterizing the memory properties of the environment has become critical for the high-fidelity control of qubits and other advanced quantum systems. However, current non-Markovi…
New perspectives on covariant quantum error correction
Sisi Zhou, Zi-Wen Liu, Liang Jiang
Covariant codes are quantum codes such that a symmetry transformation on the logical system could be realized by a symmetry transformation on the physical system, usually with limi…
Asymptotic theory of quantum channel estimation
Sisi Zhou, Liang Jiang
The quantum Fisher information (QFI), as a function of quantum states, measures the amount of information that a quantum state carries about an unknown parameter. The (entanglement…
An exact correspondence between the quantum Fisher information and the Bures metric
Sisi Zhou, Liang Jiang
The quantum information and the Bures metric are equivalent to each other, except at points where the rank of the density matrix changes. Here we show that by slightly modifying th…
Optimal approximate quantum error correction for quantum metrology
Sisi Zhou, Liang Jiang
For a generic set of Markovian noise models, the estimation precision of a parameter associated with the Hamiltonian is limited by the scaling where is the total p…
Optimal probes and error-correction schemes in multi-parameter quantum metrology
Wojciech Gorecki, Sisi Zhou, Liang Jiang +1
We derive a necessary and sufficient condition for the possibility of achieving the Heisenberg scaling in general adaptive multi-parameter estimation schemes in presence of Markovi…
Stochastic Estimation of Dynamical Variables
Stefan Krastanov, Sisi Zhou, Steven T. Flammia +1
Estimating the parameters governing the dynamics of a system is a prerequisite for its optimal control. We present a simple but powerful method that we call STEADY, for STochastic…
Ancilla-free quantum error correction codes for quantum metrology
David Layden, Sisi Zhou, Paola Cappellaro +1
Quantum error correction has recently emerged as a tool to enhance quantum sensing under Markovian noise. It works by correcting errors in a sensor while letting a signal imprint o…
Saturating the quantum Cramér-Rao bound using LOCC
Sisi Zhou, Chang-Ling Zou, Liang Jiang
The quantum Cramér-Rao bound (QCRB) provides an ultimate precision limit allowed by quantum mechanics in parameter estimation. Given any quantum state dependent on a single paramet…
A modern description of Rayleigh's criterion
Sisi Zhou, Liang Jiang
Rayleigh's criterion states that it becomes essentially difficult to resolve two incoherent optical point sources separated by a distance below the width of point spread functions…
Achieving the Heisenberg limit in quantum metrology using quantum error correction
Sisi Zhou, Mengzhen Zhang, John Preskill +1
Quantum metrology has many important applications in science and technology, ranging from frequency spectroscopy to gravitational wave detection. Quantum mechanics imposes a fundam…