Cancellation of internal quantum noise of an amplifier by quantum correlation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Jia Kong
  • F. Hudelist
  • Z. Y. Ou
  • Weiping Zhang

Detail(s)

Original languageEnglish
Article number033608
Journal / PublicationPhysical Review Letters
Volume111
Issue number3
Publication statusPublished - 18 Jul 2013
Externally publishedYes

Abstract

Quantum noise is usually added in an amplification process through the internal degrees of the amplifier. Coupling the squeezed state to the internal degree can suppress the extra noise. Here, we demonstrate another method: when the internal degree of the amplifier is correlated with the input signal via quantum entanglement, quantum destructive interference between the input and the internal degree may result in noise reduction at the amplified output. We achieve a quantum noise reduction of 2.3 dB at the output and an improvement of 4.0±0.2 dB in signal-to-noise ratio during the amplification process with a quantum noise gain of 4.5 dB. © 2013 American Physical Society.

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Citation Format(s)

Cancellation of internal quantum noise of an amplifier by quantum correlation. / Kong, Jia; Hudelist, F.; Ou, Z. Y. et al.
In: Physical Review Letters, Vol. 111, No. 3, 033608, 18.07.2013.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review