Noise-powered probabilistic concentration of phase information

Usuga MA, Müller C, Wittmann C, Marek P, Filip R, Marquardt C, Leuchs G, Andersen UL (2010)

Publication Type: Journal article

Publication year: 2010

Journal

Book Volume: 6

Pages Range: 767-771

Journal Issue: 10

DOI: 10.1038/nphys1743

Abstract

Phase-insensitive optical amplification of an unknown quantum state is known to be a fundamentally noisy operation that inevitably adds noise to the amplified state. However, this fundamental noise penalty in amplification can be circumvented by resorting to a probabilistic scheme as recently proposed and demonstrated in refs 6, 7, 8. These amplifiers are based on highly non-classical resources in a complex interferometer. Here we demonstrate a probabilistic quantum amplifier beating the fundamental quantum limit using a thermal-noise source and a photon-number-subtraction scheme. The experiment shows, surprisingly, that the addition of incoherent noise leads to a noiselessly amplified output state with a phase uncertainty below the uncertainty of the state before amplification. This amplifier might become a valuable quantum tool in future quantum metrological schemes and quantum communication protocols. © 2010 Macmillan Publishers Limited. All rights reserved.

Authors with CRIS profile

Involved external institutions

Palacky University Olomouc / Univerzita Palackého v Olomouci Czech Republic (CZ) Technical University of Denmark / Danmarks Tekniske Universitet (DTU) Denmark (DK)

How to cite

APA:

Usuga, M.A., Müller, C., Wittmann, C., Marek, P., Filip, R., Marquardt, C.,... Andersen, U.L. (2010). Noise-powered probabilistic concentration of phase information. Nature Physics, 6(10), 767-771. https://doi.org/10.1038/nphys1743

MLA:

Usuga, Mario A., et al. "Noise-powered probabilistic concentration of phase information." Nature Physics 6.10 (2010): 767-771.

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