Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect

Abstract

In open quantum systems, the precision of metrology inevitably suffers from the noise. In Markovian open quantum dynamics, the precision can not be improved by using entangled probes although the measurement time is effectively shortened. However, it was predicted over one decade ago that in a non-Markovian one, the error can be significantly reduced by the quantum Zeno effect (QZE) [Chin, Huelga, and Plenio, Phys. Rev. Lett. 109, 233601 (2012)]. In this work, we apply a recently-developed quantum simulation approach to experimentally verify that entangled probes can improve the precision of metrology by the QZE. Up to n = 7 qubits, we demonstrate that the precision has been improved by a factor of n 1/4 , which is consistent with the theoretical prediction. Our quantum simulation approach may provide an intriguing platform for experimental verification of various quantum metrology schemes.

Practically Enhanced Hyperentanglement Concentration for Polarization-Spatial Hyperentangled Bell States with Linear Optics and Common Single-Photon Detectors

“…However, this does not work in a practical experiment, and the schemes may be negatively affected by noise during application [61]. Quantum Zeno effect can enhance the measurement accuracy of entangled probes to resist these disadvantages [62].…”

Deterministic Hyperparallel Control Gates with Weak Kerr Effects

“…Quantum computation, so far, plays an imperative function in quantum information processing (QIP) and facilitates the solution of intractable problems in many fields. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Quantum logic gates, as fundamental components of complicated quantum circuits, are essential for quantum computation. [16][17][18][19][20] It is extensively proven that any quantum computing process can be completed via some elementary single-qubit operations and two-qubit entangled gates, e.g., controlled-NOT (CNOT) gate.…”

Multiphonon Bundle Emission in a Strong‐Coupling Cavity Optomechanical System

“…[3] Among various multiquanta system, n-phonon system [4] has attached much attention due to the potential application in quantum information, metrology and studies of fundamental physics. [5][6][7][8][9][10][11][12][13][14][15][16] At the same time, acoustic waves are immune to radiation losses into the vacuum because of they can only propagate in a medium. Thus, the acoustic waves become strong candidates for the engineering of solid-state quantum devices and on-chip quantum communications.…”