Teleportation-based noiseless quantum amplification of coherent states of light

• URL: http://arxiv.org/abs/2110.06040v1
• Date: Tue, 12 Oct 2021 14:39:08 GMT
• Title: Teleportation-based noiseless quantum amplification of coherent states of light
• Authors: Jarom\'ir Fiur\'a\v{s}ek
• Abstract summary: We propose and theoretically analyze a teleportation-based scheme for high-fidelity noiseless quantum amplification of coherent states of light. The scheme requires conditioning on the outcomes of homodyne measurements in the teleportation protocol. We present and analyze predictions of this phase-space model of the noiseless tele-amplifier.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose and theoretically analyze a teleportation-based scheme for high-fidelity noiseless quantum amplification of coherent states of light. In our approach, the probabilistic noiseless quantum amplification operation is encoded into a suitable auxiliary two-mode entangled state and then applied to the input coherent state via continuous-variable quantum teleportation. The scheme requires conditioning on the outcomes of homodyne measurements in the teleportation protocol. In contrast to high-fidelity noiseless quantum amplifiers based on combination of conditional single-photon addition and subtraction, the present scheme requires only photon subtraction in combination with auxiliary Gaussian squeezed vacuum states. We first provide a pure-state description of the protocol which allows us to to clearly explain its principles and functioning. Next we develop a more comprehensive model based on phase-space representation of quantum states, that accounts for various experimental imperfections such as excess noise in the auxiliary squeezed states or limited efficiency of the single-photon detectors that can only distinguish the presence or absence of photons. We present and analyze predictions of this phase-space model of the noiseless tele-amplifier.

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