Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Certified quantum non-demolition measurement of atomic spins

R. J. Sewell, M. Napolitano, N. Behbood, Giorgio Colangelo, Ferran Martin Ciurana, Morgan W. Mitchell

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We report certified quantum non-demolition measurement of atomic spins using criteria developed for continuous variable experiments in optics. We observe quantum state preparation and information–damage trade–off beyond classical limits by seven and twelve standard deviations.
DOI
10.1364/cleo_qels.2014.fth1b.4

Related papers

Certified quantum non-demolition measurement of material systems

Morgan W. Mitchell, Marco Koschorreck, Marcin Kubasik +2 more

An extensive debate on quantum non-demolition (QND) measurement, reviewed in Grangier et al (1998 Nature 396 537), finds that true QND measurements must have both non-classical state-preparation capability and non-classical information-damage tradeoff. Existing figures of merit for these non-classicality criteria require direct measurement of the signal variable and are thus difficult to apply to optically-probed material systems. Here we describe a method to demonstrate both criteria without need for to direct signal measurements. Using a covariance matrix formalism and a general noise model, we compute meter observables for QND measurement triples, which suffice to compute all QND figures of merit. The result will allow certified QND measurement of atomic spin ensembles using existing techniques.

arXiv:1203.6584•New Journal of Physics•Aug 24, 2012•12 citations

Certified quantum non-demolition measurement of atomic spins

R. J. Sewell, M. Napolitano, N. Behbood +3 more

Bulletin of the American Physical Society•Jun 4, 2014•0 citations

Quantum Non-Demolition Measurements: Concepts, Theory and Practice

C. S. Unnikrishnan

This is a limited overview of quantum non-demolition (QND) measurements, with brief discussions of illustrative examples meant to clarify the essential features. In a QND measurement, the predictability of a subsequent value of a precisely measured observable is maintained and any random back-action from uncertainty introduced into a noncommuting observable is avoided. The fundamental ideas, relevant theory and the conditions and scope for applicability are discussed with some examples. Precision measurements have indeed gained from developing QND measurements. Some implementations in quantum optics, gravitational wave detectors and spin-magnetometry are discussed.

arXiv:1811.09613•Current Science•Dec 1, 2015•9 citations

Quantum non-demolition measurements using Bose-Einstein condensates

S Choi, K Burnett

We study possible scenarios for quantum non-demolition measurements using Bose-Einstein condensates. We show that the interactions between condensate atoms make it possible to measure the atom number with minimal back-action on the system. This is an example of atomic nonlinear optics that has significant implications in the quantum state preparation of the Bose condensates.

arXiv:cond-mat/0110652•Journal of Physics B Atomic Molecular and Optical Physics•Dec 19, 2001•0 citations

Optical quantum non-demolition measurements

Philippe Grangier, J.-Ph. Poizat, Jean-François Roch

We discuss some theoretical and experimental aspects of quantum non-demolition (QND) measurements in the optical domain. The efficiency of a QND measurement can be characterized using three criteria, which describe respectively the quality of the quantum measurement, the non-destruction of the signal, and the conditional variance of the output signal beam, given the output meter beam (quantum-state-preparation criterion). Quantitative limits can be defined with respect to these criteria, delimiting "classical" and "quantum" domains of operation. We describe the implementation of two experiments which fulfill these criteria, using either three-level atoms inside a doubly-resonant optical cavity, or semiconductors emitters and receivers.

Physica Scripta•Jan 1, 1994•3 citations

Demonstration of Real-Time Quantum Non-Demolition Interaction

Yu Shiozawa, Shota Yokoyama, Toshiyuki Kaji +7 more

We experimentally demonstrate real-time quantum non-demolition (QND) interaction between optical quantum states in terms of satisfying the criteria for QND measurement and generating quantum entanglement.

Frontiers in Optics•Jan 1, 2017•0 citations
An extensive debate on quantum non-demolition (QND) measurement, reviewed in Grangier et al (1998 Nature 396 537), finds that true QND measurements must have both non-classical state-preparation capability and non-classical information-damage tradeoff. Existing figures of merit for these non-classicality criteria require direct measurement of the signal variable and are thus difficult to apply to optically-probed material systems. Here we describe a method to demonstrate both criteria without need for to direct signal measurements. Using a covariance matrix formalism and a general noise model, we compute meter observables for QND measurement triples, which suffice to compute all QND figures of merit. The result will allow certified QND measurement of atomic spin ensembles using existing techniques.
This is a limited overview of quantum non-demolition (QND) measurements, with brief discussions of illustrative examples meant to clarify the essential features. In a QND measurement, the predictability of a subsequent value of a precisely measured observable is maintained and any random back-action from uncertainty introduced into a noncommuting observable is avoided. The fundamental ideas, relevant theory and the conditions and scope for applicability are discussed with some examples. Precision measurements have indeed gained from developing QND measurements. Some implementations in quantum optics, gravitational wave detectors and spin-magnetometry are discussed.
We discuss some theoretical and experimental aspects of quantum non-demolition (QND) measurements in the optical domain. The efficiency of a QND measurement can be characterized using three criteria, which describe respectively the quality of the quantum measurement, the non-destruction of the signal, and the conditional variance of the output signal beam, given the output meter beam (quantum-state-preparation criterion). Quantitative limits can be defined with respect to these criteria, delimiting "classical" and "quantum" domains of operation. We describe the implementation of two experiments which fulfill these criteria, using either three-level atoms inside a doubly-resonant optical cavity, or semiconductors emitters and receivers.