Reduction of classical measurement noise via quantum-dense metrology

Ast, M., Steinlechner, S. and Schnabel, R. (2016) Reduction of classical measurement noise via quantum-dense metrology. Physical Review Letters, 117(18), 180801. (doi: 10.1103/PhysRevLett.117.180801) (PMID:27835020)

Abstract

Quantum-dense metrology (QDM) constitutes a special case of quantum metrology in which two orthogonal phase space projections of a signal are simultaneously sensed beyond the shot noise limit. Previously it was shown that the additional sensing channel that is provided by QDM contains information that can be used to identify and to discard corrupted segments from the measurement data. Here, we demonstrate a proof-of-principle experiment in which this information is used for improving the sensitivity without discarding any measurement segments. Our measurement reached sub-shot-noise performance although initially strong classical noise polluted the data.

• Item Type: Articles
• Additional Information: This work was partly supported by the Deutsche Forschungsgemeinschaft (Sonderforschungsbereich Transregio 7 and RTG1991) and by the International Max Planck Research School for Gravitational Wave Astronomy (IMPRS-GW). S. Steinlechner was supported by the Alexander von Humboldt foundation and the European Commission H2020-MSCA-IF-2014 actions, grant agreement number 658366.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Steinlechner, Dr Sebastian
• Authors: Ast, M., Steinlechner, S., and Schnabel, R.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Copyright Holders: Copyright © 2016 American Physical Society
• First Published: First published in Physical Review Letters 117:180801
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher