High Fidelity Artificial Quantum Thermal State Generation using Encoded Coherent States

• URL: http://arxiv.org/abs/2405.03881v2
• Date: Fri, 11 Oct 2024 16:22:46 GMT
• Title: High Fidelity Artificial Quantum Thermal State Generation using Encoded Coherent States
• Authors: Haley Weinstein, Bruno Avritzer, Todd A. Brun, Jonathan L. Habif,
• Abstract summary: Quantum steganography is a powerful method for information security where communications are disguised as naturally occurring noise in a channel. We encoded the phase and amplitude of weak coherent laser states such that a third party monitoring the communications channel would see an amalgamation of states indistinguishable from thermal noise light.
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• Abstract: Quantum steganography is a powerful method for information security where communications between a sender and receiver are disguised as naturally occurring noise in a channel. We encoded the phase and amplitude of weak coherent laser states such that a third party monitoring the communications channel, measuring the flow of optical states through the channel, would see an amalgamation of states indistinguishable from thermal noise light. Using quantum state tomography, we experimentally reconstructed the density matrices for artificially engineered thermal states and spontaneous emission from an optical amplifier and verified a state fidelity F>0.98 when compared with theoretical thermal states.

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