Journal
NATURE PHYSICS
Volume 6, Issue 10, Pages 767-771Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1743
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Funding
- EU
- BIOP Graduate school
- Lundbeck foundation
- DFG [LE 408/19-1]
- Czech Ministry of Education [MSM 6198959213, LC06007]
- GA CR [202/08/0224, P205/10/P319]
- Alexander von Humboldt Foundation
- Lundbeck Foundation [R13-2007-1274] Funding Source: researchfish
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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(1-5). However, this fundamental noise penalty in amplification can be circumvented by resorting to a probabilistic scheme as recently proposed and demonstrated in refs 6-8. 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(9). 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.
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