Coherence of quantum states after noiseless attenuation

Shringarpure, S. U.; Nunn, Cory M.; Pittman, T. B.; Franson, J. D.

doi:10.1103/physreva.105.013704

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Although not revealed by the photon counting measurements reported here, ZPS can preserve the coherence of quantum states [31], making it useful for quantum communications as a noiseless attenuator [9][10][11]. Our results provide further insight into the nature of this transformation and its relationship to other techniques in quantum state engineering by conditional measurements.…”

Section: Discussionmentioning

confidence: 64%

“…For example, our observations confirmed the nonclassical [20] sub-Poissonian statistics of the heralded single photon ρ1 . Furthermore, quantum state tomography or some other phase-dependent measurement would reveal that ZPS not only attenuates quantum states, but does so noiselessly (i.e., preserves their coherence) [31]. This property is exactly what makes ZPS promising for applications in quantum communication [9][10][11].…”

Section: Resultsmentioning

confidence: 96%

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Modifying quantum optical states by zero-photon subtraction

2022

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The process of single-photon subtraction (SPS) is known to dramatically alter the properties of certain quantum optical states. Somewhat surprisingly, subtracting zero photons can also modify quantum states and has practical applications in quantum communication. Here we experimentally investigate zero-photon subtraction (ZPS) using a wide variety of input states and conditional measurements based on actively detecting zero photons in one output port of a variable beamsplitter. We find that SPS and ZPS can exhibit complementary behavior depending on the photon statistics of the input states and highlight deeper connections with Mandel's Q parameter for classifying quantum states.

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Section: Discussionmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 96%

Modifying quantum optical states by zero-photon subtraction

2022

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“…This corresponds to a coherent superposition of a one-photon subtraction with a zerophoton subtraction process, with the latter sometimes referred to as "noiseless attenuation" in the literature [20,21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing nonclassical properties of quantum states of light using linear optics

Mattos

Vidiella-Barranco

2023

Opt. Lett.

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In this Letter, we present a simple and versatile scheme for enhancing the nonclassical properties of light states using only linear optics and photodetectors. By combining a coherent state |α〉 and an arbitrary pure state of light |ϕ〉 (excluding coherent states) at two beam splitters, we show that the amplitude α of the coherent state can be tuned to filter out specific Fock components and generate states of light with increased nonclassical features. We provide two examples of input states and demonstrate the effectiveness of our scheme in enhancing the sub-Poissonian statistics or the quadrature squeezing of the output states.

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