Sagnac interferometer as a speed-meter-type, quantum-nondemolition gravitational-wave detector [PDF]
Physical Review D, 2003 According to quantum measurement theory, "speed meters" -- devices that measure the momentum, or speed, of free test masses -- are immune to the standard quantum limit (SQL). It is shown that a Sagnac-interferometer gravitational-wave detector is a speed meter and therefore in principle it can beat the SQL by large amounts over a wide band of ...
Yanbei Chen
exaly +3 more sources
High-efficiency quantum-nondemolition single-photon-number-resolving detector [PDF]
Physical Review A, 2005 4 pages, 4 figures. Significantly revised.
W J Munro, Kae Nemoto, T P Spiller
exaly +3 more sources
Quantum nondemolition measurements of a flux qubit coupled to a noisy detector [PDF]
Chinese Physics B, 2011 6 pages, 3 ...
Jiang, Wei, Yu, Yang, Wei, Lianfu
exaly +3 more sources
Single-Shot Quantum Nondemolition Detection of Individual Itinerant Microwave Photons
Physical Review X, 2018 Single-photon detection is an essential component in many experiments in quantum optics, but it remains challenging in the microwave domain. We realize a quantum nondemolition detector for propagating microwave photons and characterize its performance ...
Jean-Claude Besse +7 more
doaj +2 more sources
Multipartite entanglement purification with quantum nondemolition detectors [PDF]
The European Physical Journal D, 2009 We present a scheme for multipartite entanglement purification of quantum systems in a Greenberger-Horne-Zeilinger state with quantum nondemolition detectors (QNDs). This scheme does not require the controlled-not gates which cannot be implemented perfectly with linear optical elements at present, but QNDs based on cross-Kerr nonlinearities.
Sheng, Yu-Bo +4 more
openaire +2 more sources
Using nanokelvin quantum thermometry to detect timelike Unruh effect in a Bose–Einstein condensate
European Physical Journal C: Particles and Fields, 2023 It is found that the Unruh effect can not only arise out of the entanglement between two sets of modes spanning the left and right Rindler wedges, but also between modes spanning the future and past light cones.
Zehua Tian, Jiliang Jing
doaj +1 more source
Single-photon quantum-nondemolition detectors constructed with linear optics and projective measurements [PDF]
Physical Review A, 2002 Optical quantum nondemolition devices can provide essential tools for quantum information processing. Here, we describe several optical interferometers that signal the presence of a single photon in a particular input state without destroying it.
Kok, Pieter +2 more
openaire +2 more sources
Generalized Rotating‐Wave Approximation for the Quantum Rabi Model with Optomechanical Interaction
Annalen der Physik, Volume 535, Issue 11, November 2023., 2023 The generalized rotating‐wave approximation (G‐RWA) to calculate the energy spectrum of the quantum Rabi model with optomechanical interaction for arbitrary large couplings is implemented. The system behaves as atom‐cavity polaritons interacting with displaced phonons, leading to spectra in very good agreement with numerical results.
Wallace H. Montaño, Jesús A. Maytorena
wiley +1 more source
Memoryless Quantum Repeaters Based on Cavity‐QED and Coherent States
Advanced Quantum Technologies, Volume 6, Issue 8, August 2023., 2023 A quantum repeater scheme based on cavity quantum electrodynamics and quantum error correction of channel loss via rotation‐symmetric bosonic codes is proposed to distribute atomic entangled states over long distances without memories and at high clock rates.
Pei‐Zhe Li, Peter van Loock
wiley +1 more source
Statistical Methods for Quantum State Verification and Fidelity Estimation
Advanced Quantum Technologies, Volume 5, Issue 5, May 2022., 2022 How can one verify that a certain quantum state has been prepared in a quantum device? This question is essential for various tasks in quantum information processing. This article presents a pedagogical review on this topic. Starting from the theory of hypothesis testing, the current protocols for quantum state verification and fidelity estimation are ...
Xiao‐Dong Yu +2 more
wiley +1 more source