Abstract
Quantum mechanics imposes stringent constraints on the amplification of a quantum signal. Deterministic amplification of an unknown quantum state always implies the addition of a minimal amount of noise. Linear and noiseless amplification is allowed in principle provided that it only works probabilistically. Here we present a probabilistic amplifier that combines two quantum state comparison amplifiers (SCAMP) together with a feed-forward state correction strategy. Our system outperforms the unambiguous state discrimination (USD) measure-and-resend based amplifier in terms of the success probability-fidelity product and requires a more complex experimental setting.
Original language | English |
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Title of host publication | Quantum Technologies 2018 |
Editors | Jürgen Stuhler, Andrew J. Shields, Miles J. Padgett |
Place of Publication | Bellingham, Washington |
Number of pages | 10 |
Volume | 10674 |
ISBN (Electronic) | 9781510618749 |
DOIs | |
Publication status | Published - 21 May 2018 |
Event | Quantum Technologies 2018 - Strasbourg, France Duration: 23 Apr 2018 → 25 Apr 2018 |
Conference
Conference | Quantum Technologies 2018 |
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Country/Territory | France |
City | Strasbourg |
Period | 23/04/18 → 25/04/18 |
Funding
The work was supported by the UK Quantum Technology Hub for Quantum Communications Technologies funded by UK Engineering and Physical Sciences Research Council (EP/M013472/1).
Keywords
- coherent states
- optical amplifier
- probabilistic amplifier
- quantum amplifier
- quantum technologies
- state amplification
- state comparison