Efficiency limits for linear optical processing of single photons and single-rail qubits

Berry, Dominic W.; Lvovsky, A. I.; Sanders, Barry C.

doi:10.1364/josab.24.000189

Cited by 4 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Usually efficiency is used to describe a process for producing a state. However, it is also convenient to regard efficiency as a measure on the state itself, regardless of the process used to produce it [8][9][10][11][12]. Specifically, Ref.…”

Section: Single-mode Measures Of Efficiencymentioning

confidence: 99%

“…Under this processing we understand arbitrary interferometric transformations and conditioning on results of arbitrary destructive measurements on some of the optical modes involved. The efforts to construct such a scheme began in 2004, mostly ending with various no-go results [8][9][10][11]. The most general result to date was obtained in Ref.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preservation of loss in linear-optical processing

Berry

Lvovsky

2011

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

We propose a measure of quantum efficiency of a multimode state of light that quantifies the amount of optical loss this state has experienced, and prove that this efficiency cannot increase in any linear-optical processing with destructive conditional measurements. Any loss that has affected a state can neither be removed nor redistributed so as to further increase the efficiency in higher-efficiency modes at the expense of lower-efficiency modes. This result eliminates the possibility of catalytically improving photon sources.Comment: 7 pages, 2 figures, expanded explanatio

show abstract

Section: Single-mode Measures Of Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preservation of loss in linear-optical processing

Berry

Lvovsky

2011

Phys. Rev. A

Self Cite

View full text Add to dashboard Cite

show abstract

“…These results were hypothesized in Refs. [6,7], which provided numerical evidence and gave proofs in some special cases. Tightness of these results has also been demonstrated.…”

mentioning

confidence: 99%

Linear-Optical Processing Cannot Increase Photon Efficiency

Berry

Lvovsky

2010

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

We answer the question whether linear-optical processing of the states produced by one or multiple imperfect single-photon sources can improve the single-photon fidelity. This processing can include arbitrary interferometers, coherent states, feedforward, and conditioning on results of detections. We show that without introducing multiphoton components, the single-photon fraction in any of the single-mode states resulting from such processing cannot be made to exceed the efficiency of the best available photon source. If multiphoton components are allowed, the single-photon fidelity cannot be increased beyond 1/2. We propose a natural general definition of the quantum-optical state efficiency, and show that it cannot increase under linear-optical processing.

show abstract

“…In particular, the logic gates based upon ferroelectric liquid crystals [24], liquid-crystalline cells [25,26], silicon micro-ring resonators [27,28] and local nonlinear Mach-Zehnder interferometer [29] have been proposed. Today the main attention is focused on quantum logic gates and quantum computing [30][31][32][33][34][35][36][37][38][39][40][41]. This is because the quantum logic gates have minimal sizes.…”

mentioning

confidence: 99%