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Journal articles
Implementation of a non-deterministic optical noiseless amplifier
Abstract : Quantum mechanics imposes that any amplifier that works independently on the phase of the input signal has to introduce some excess noise. The impossibility of such a noiseless amplifier is rooted into unitarity and linearity of quantum evolution. A possible way to circumvent this limitation is to interrupt such evolution via a measurement, providing a random outcome able to herald a successful - and noiseless - amplification event. Here we show a successful realisation of such an approach; we perform a full characterization of an amplified coherent state using quantum homodyne tomography, and observe a strong heralded amplification, with about 6dB gain and a noise level significantly smaller than the minimal allowed for any ordinary phase-independent device.
Cited literature [21 references]
https://hal-iogs.archives-ouvertes.fr/hal-00553571
Contributor : Philippe Grangier <>
Submitted on : Friday, December 4, 2015 - 2:44:57 PM
Last modification on : Wednesday, September 16, 2020 - 5:45:30 PM
Long-term archiving on: : Saturday, April 29, 2017 - 4:51:08 AM
Contributor : Philippe Grangier <>
Submitted on : Friday, December 4, 2015 - 2:44:57 PM
Last modification on : Wednesday, September 16, 2020 - 5:45:30 PM
Long-term archiving on: : Saturday, April 29, 2017 - 4:51:08 AM
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00553571.pdf
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