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• W3000355812 abstract "Entanglement distillation is an efficient method to retrieve high-quality entanglement from a large number of noise-damped entanglement states. Many investigations on continuous variable entanglement distillation have focused on low-loss or medium-loss channels. Herein, we primarily study entanglement distillation in extremely lossy (total channel transmittance <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>η<!-- η --></mml:mi> <mml:mo>≪<!-- ≪ --></mml:mo> <mml:mn>1</mml:mn> </mml:math> ) or even near-zero transmittance ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>η<!-- η --></mml:mi> <mml:mo>≈<!-- ≈ --></mml:mo> <mml:mn>0</mml:mn> </mml:math> ) channels. In particular, we analyze the manner in which entanglement and success probability decrease as <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>η<!-- η --></mml:mi> <mml:mo stretchy=false>→<!-- → --></mml:mo> <mml:mn>0</mml:mn> </mml:math> . The performances of conventional biside photon subtraction and one-time photon subtraction on two optical modes separated by <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>L</mml:mi> </mml:math> km are investigated. The motivation for our study includes the recent advancements in twin-field quantum key distribution, wherein single-photon detection is sufficient to provide a useful private key. In the same vein, we propose an entanglement distillation scheme with an efficiency of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>O</mml:mi> <mml:mo stretchy=false>(</mml:mo> <mml:msqrt> <mml:mi>η<!-- η --></mml:mi> </mml:msqrt> <mml:mo stretchy=false>)</mml:mo> </mml:math> using one-time photon subtraction and weak coherent state injection. Thus, our proposed scheme provides a method for distilling extremely damped entanglement states for continuous variable quantum information processing." @default.
• W3000355812 created "2020-01-23" @default.
• W3000355812 creator A5034274782 @default.
• W3000355812 date "2020-01-22" @default.
• W3000355812 modified "2023-10-12" @default.
• W3000355812 title "$O(sqrteta)$O(η) efficiency entanglement distillation with one-time photon subtraction over near-zero transmittance bosonic channel" @default.
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• W3000355812 doi "https://doi.org/10.1364/josab.381090" @default.
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