Optical amplifier-powered quantum optical amplification

Jeffers, John

doi:10.1103/physreva.83.053818

Cited by 19 publications

(21 citation statements)

References 33 publications

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“…The maximal possible p is then equal to min j (λ Moreover, it can be shown by using Property 1 that this bound is saturated only by a leakless transform in the small-amplitude regime. From criterion (6), if there exists an amplification transform with a nontrivial leak, succeeding with some probability p, then the relation…”

Section: A Small-amplitude Amplificationmentioning

confidence: 99%

Truly noiseless probabilistic amplification

Dunjko

Andersson²

2012

Phys. Rev. A

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Most of the schemes for "noiseless" amplification of coherent states, which have recently been attracting theoretical and experimental interest, share a common trait: The amplification is not truly noiseless, or perfect, for nonzero success probability. While this must hold true for all phase-independent amplification schemes, in this work we point out that truly noiseless amplification is indeed possible, provided that the states which we wish to amplify come from a finite set. Perfect amplification with unlimited average gain is then possible with finite success probability, for example, using techniques for unambiguously distinguishing between quantum states. Such realizations require only linear optics, no single-photon sources, and no photon counting. We also investigate the optimal success probability of perfect amplification of a symmetric set of coherent states. There are two regimes: low-amplitude amplification, where the target amplitude is below one, and general amplification. For the low-amplitude regime, analytic results for the optimal amplification success probabilities can be obtained. In this case a natural bound imposed by the ratio of success probabilities of optimal unambiguous discrimination of the source and amplified states can always be reached. We also show that for general amplification this bound cannot always be satisfied.

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Section: A Small-amplitude Amplificationmentioning

confidence: 99%

Truly noiseless probabilistic amplification

Dunjko

Andersson²

2012

Phys. Rev. A

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“…Compared to the scheme in [12,13], the addition of thermal noise at the initial step is replaced by the use of quantum-limited PILA in our scheme while the photon subtraction at the last step can be replaced by the other photonic operations. The advantage of using the quantum-limited PILA over the thermal noise seems rather obvious because the former additionally gives a displacement effect, i.e., the increase of average amplitude, as well as the addition of noise [29]. As the PILA and the photonic operations studied here are all within current experimental reach, our scheme represents another practical possibility for a noise-reduced quantum amplifier.…”

Section: Introductionmentioning

confidence: 84%

“…Note added. After the completion of this work, we became aware of a related work [29] where the photon subtraction following the quantum-noise-limited amplifier was considered. [2] C. M. Caves, Phys.…”

Section: Discussionmentioning

confidence: 99%

Quantum linear amplifier enhanced by photon subtraction and addition

Kim

Lee

et al. 2012

Phys. Rev. A

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A deterministic quantum amplifier inevitably adds noise to an amplified signal due to the uncertainty principle in quantum physics. We here investigate how a quantum-noise-limited amplifier can be improved by additionally employing the photon subtraction, the photon addition, and a coherent superposition of the two, thereby making a probabilistic, heralded, quantum amplifier. We show that these operations can enhance the performance in amplifying a coherent state in terms of intensity gain, fidelity, and phase uncertainty. In particular, the photon subtraction turns out to be optimal for the fidelity and the phase concentration among these elementary operations, while the photon addition also provides a significant reduction in the phase uncertainty with the largest gain effect.

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“…The original scheme was based on the quantum-scissors device [8] and further protocols were proposed [9][10][11][12], some based on photon addition and subtraction [9] and on noise addition and photon subtraction [10,11], Several were later experimentally realized [13][14][15][16][17]. Each scheme has advan tages and disadvantages.…”

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confidence: 99%

Experimental Implementation of a Quantum Optical State Comparison Amplifier

et al. 2015

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We present an experimental demonstration of a practical nondeterministic quantum optical amplification scheme that employs two mature technologies, state comparison and photon subtraction, to achieve amplification of known sets of coherent states with high fidelity. The amplifier uses coherent states as a resource rather than single photons, which allows for a relatively simple light source, such as a diode laser, providing an increased rate of amplification. The amplifier is not restricted to low amplitude states. With respect to the two key parameters, fidelity and the amplified state production rate, we demonstrate significant improvements over previous experimental implementations, without the requirement of complex photonic components. Such a system may form the basis of trusted quantum repeaters in nonentanglement-based quantum communications systems with known phase alphabets, such as quantum key distribution or quantum digital signatures.

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Optical amplifier-powered quantum optical amplification

Cited by 19 publications

References 33 publications

Truly noiseless probabilistic amplification

Truly noiseless probabilistic amplification

Quantum linear amplifier enhanced by photon subtraction and addition

Experimental Implementation of a Quantum Optical State Comparison Amplifier

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