196 citations · 1.2k across the 29 of their papers we have counts for
29 papers
Noise-Symmetry Optimization of Quantum Error-Corrected Metrology
Shuyun Su, Shengshi Pang
Quantum error correction (QEC) codes have emerged as a powerful tool to protect quantum-enhanced metrology against noise. However, the ability to correct errors alone does not guar…
Hamiltonian Conditions for Dark Modes in Multimode Bosonic Systems
Zuxin Wu, Shengshi Pang
Dark modes arise when destructive interference prevents selected bosonic degrees of freedom from coupling to environmental channels. We formulate a Hamiltonian criterion for identi…
Optimization of probabilistic quantum search algorithm with a priori information
Yutong Huang, Shengshi Pang
A quantum computer encodes information in quantum states and runs quantum algorithms to surpass the classical counterparts by exploiting quantum superposition and quantum correlati…
Optimization for the propagation of a multiparticle quantum walk in a one-dimensional lattice
Daer Feng, Shengshi Pang
The quantum walk is a quantum counterpart of the classical random walk that exhibits nonclassical behaviors and outperforms the classical random walk in various aspects. It has bee…
Collapse and revival structure of information backflow for a central spin coupled to a finite spin bath
Jingyi Fan, Shengshi Pang
The Markovianity of quantum dynamics is an important property of open quantum systems determined by various ingredients of the system and bath. Apart from the system-bath interacti…
Achieving Heisenberg Scaling on Measurement of A Three-Qubit System via Quantum Error Correction
Le Hu, Shengshi Pang, Andrew Jordan
In many-body quantum systems, the quantum Fisher information an observer can obtain is susceptible to decoherence. Consequently, quantum enhanced metrology, such as Heisenberg scal…
Variational principle for optimal quantum controls in quantum metrology
Jing Yang, Shengshi Pang, Zekai Chen +2
We develop a variational principle to determine the quantum controls and initial state which optimizes the quantum Fisher information, the quantity characterizing the precision in…
Super-Heisenberg scaling in Hamiltonian parameter estimation in the long-range Kitaev chain
Jing Yang, Shengshi Pang, Adolfo del Campo +1
In quantum metrology, nonlinear many-body interactions can enhance the precision of Hamiltonian parameter estimation to surpass the Heisenberg scaling. Here, we consider the estima…
Direct Fidelity Estimation of Quantum States using Machine Learning
Xiaoqian Zhang, Maolin Luo, Zhaodi Wen +4
In almost all quantum applications, one of the key steps is to verify that the fidelity of the prepared quantum state meets expectations. In this Letter, we propose a new approach…
Optimal measurements for quantum multiparameter estimation with general states
Jing Yang, Shengshi Pang, Yiyu Zhou +1
We generalize the approach by Braunstein and Caves [Phys. Rev. Lett. 72, 3439 (1994)] to quantum multi-parameter estimation with general states. We derive a matrix bound of the cla…
Quantum state tomography with time-continuous measurements: reconstruction with resource limitations
Areeya Chantasri, Shengshi Pang, Teerawat Chalermpusitarak +1
We propose and analyze quantum state estimation (tomography) using continuous quantum measurements with resource limitations, allowing the global state of many qubits to be constru…
Abrupt transitions between Markovian and non-Markovian dynamics in open quantum systems
Shengshi Pang, Todd A. Brun, Andrew N. Jordan
A rapid restoration of the bath state is usually required to induce Markovian dynamics for an open quantum system, which typically can be realized only in limits such as weak syste…
Quantum parameter estimation with the Landau-Zener transition
Jing Yang, Shengshi Pang, Andrew N. Jordan
We investigate the fundamental limits in precision allowed by quantum mechanics from Landau-Zener transitions, concerning Hamiltonian parameters. While the Landau-Zener transition…
Optimal adaptive control for quantum metrology with time-dependent Hamiltonians
Shengshi Pang, Andrew N. Jordan
Quantum metrology has been studied for a wide range of systems with time-independent Hamiltonians. For systems with time-dependent Hamiltonians, however, due to the complexity of d…
Protecting weak measurements against systematic errors
Shengshi Pang, Jose Raul Gonzalez Alonso, Todd A. Brun +1
In this work, we consider the systematic error of quantum metrology by weak measurements under decoherence. We derive the systematic error of maximum likelihood estimation in gener…
Precision optical displacement measurements using biphotons
Kevin Lyons, Shengshi Pang, Paul G. Kwiat +1
We propose and examine the use of biphoton pairs, such as those created in parametric down conversion or four-wave mixing, to enhance the precision and the resolution of measuring…
Suppressing technical noises in weak measurement by entanglement
Shengshi Pang, Todd A. Brun
Postselected weak measurement has aroused broad interest for its distinctive ability to amplify small physical quantities. However, the low postselection efficiency to obtain a lar…
Improving the precision of weak measurements by postselection measurement
Shengshi Pang, Todd A. Brun
Postselected weak measurement is a useful protocol for amplifying weak physical effects. However, there has recently been controversy over whether it gives any advantage in precisi…
Quantum metrology for a general Hamiltonian parameter
Shengshi Pang, Todd A. Brun
Quantum metrology enhances the sensitivity of parameter estimation using the distinctive resources of quantum mechanics such as entanglement. It has been shown that the precision o…
Entanglement-assisted weak value amplification
Shengshi Pang, Justin Dressel, Todd A. Brun
Large weak values have been used to amplify the sensitivity of a linear response signal for detecting changes in a small parameter, which has also enabled a simple method for preci…
Amplification limit of weak measurements: a variational approach
Shengshi Pang, Todd A. Brun, Shengjun Wu +1
Post-selected weak measurement has been widely used in experiments to observe weak effects in various physical systems. However, it is still unclear how large the amplification abi…
Unambiguous Examining the Orthogonality of Multiple Quantum States
Shengshi Pang, Shengjun Wu
In this article, we study an opposite problem of universal quantum state comparison, that is unambiguous determining whether multiple unknown quantum states from a Hilbert space ar…
Weak measurement with orthogonal pre-selection and post-selection
Shengshi Pang, Shengjun Wu, Zeng-Bing Chen
Weak measurement is a novel quantum measurement scheme, which is usually characterized by the weak value formalism. To guarantee the validity of the weak value formalism, the fidel…
Nonexistence of a universal quantum machine to examine the precision of unknown quantum states
Shengshi Pang, Shengjun Wu, Zeng-Bing Chen
In this work, we reveal a new type of impossibility discovered in our recent research which forbids comparing the closeness of multiple unknown quantum states with any non-trivial…