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- Publisher Website: 10.1103/PhysRevA.95.042303
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Article: Quantum amplification and purification of noisy coherent states
Title | Quantum amplification and purification of noisy coherent states |
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Authors | |
Issue Date | 2017 |
Publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ |
Citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2017, v. 95 n. 4, article no. 042303 , p. 1-9 How to Cite? |
Abstract | Quantum-limited amplifiers increase the amplitude of quantum signals at the price of introducing additional noise. Quantum purification protocols operate in the reverse way, by reducing the noise while attenuating the signal. Here we investigate a scenario that interpolates between these two extremes. We search for the optimal physical process that generates M approximate copies of a pure and amplified coherent state, starting from N copies of a noisy coherent state with Gaussian modulation. We prove that the optimal deterministic processes are always Gaussian, whereas non-Gaussianity powers up probabilistic advantages in suitable parameter regimes. The optimal processes are experimentally realizable with current technology, both in the deterministic and in the probabilistic scenario. In view of this fact, we provide benchmarks that can be used to certify the experimental demonstration of the quantum-enhanced amplification and purification of coherent states. |
Persistent Identifier | http://hdl.handle.net/10722/242402 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 1.081 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | ZHAO, X | - |
dc.contributor.author | Chiribella, G | - |
dc.date.accessioned | 2017-07-24T01:39:21Z | - |
dc.date.available | 2017-07-24T01:39:21Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2017, v. 95 n. 4, article no. 042303 , p. 1-9 | - |
dc.identifier.issn | 2469-9926 | - |
dc.identifier.uri | http://hdl.handle.net/10722/242402 | - |
dc.description.abstract | Quantum-limited amplifiers increase the amplitude of quantum signals at the price of introducing additional noise. Quantum purification protocols operate in the reverse way, by reducing the noise while attenuating the signal. Here we investigate a scenario that interpolates between these two extremes. We search for the optimal physical process that generates M approximate copies of a pure and amplified coherent state, starting from N copies of a noisy coherent state with Gaussian modulation. We prove that the optimal deterministic processes are always Gaussian, whereas non-Gaussianity powers up probabilistic advantages in suitable parameter regimes. The optimal processes are experimentally realizable with current technology, both in the deterministic and in the probabilistic scenario. In view of this fact, we provide benchmarks that can be used to certify the experimental demonstration of the quantum-enhanced amplification and purification of coherent states. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ | - |
dc.relation.ispartof | Physical Review A: covering atomic, molecular, and optical physics and quantum information | - |
dc.rights | Copyright 2017 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevA.95.042303 | - |
dc.title | Quantum amplification and purification of noisy coherent states | - |
dc.type | Article | - |
dc.identifier.email | Chiribella, G: giulio@hku.hk | - |
dc.identifier.authority | Chiribella, G=rp02035 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevA.95.042303 | - |
dc.identifier.scopus | eid_2-s2.0-85017139576 | - |
dc.identifier.hkuros | 273304 | - |
dc.identifier.volume | 95 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | article no. 042303, p. 1 | - |
dc.identifier.epage | article no. 042303, p. 9 | - |
dc.identifier.isi | WOS:000399378400002 | - |
dc.identifier.issnl | 2469-9926 | - |