Feasibility study of frequency-encoded photonic qubits over a free-space channel

• URL: http://arxiv.org/abs/2412.06104v1
• Date: Sun, 08 Dec 2024 23:27:38 GMT
• Title: Feasibility study of frequency-encoded photonic qubits over a free-space channel
• Authors: Stéphane Vinet, Wilson Wu, Yujie Zhang, Thomas Jennewein,
• Abstract summary: We propose and demonstrate a novel approach that leverages field-widened interferometers to decode frequency-bins transmitted over free-space channels. Our passive approach expands the versatility of frequency-bin encoding, paving the way towards long-range and fluctuating channels.
• Score: 9.7383000873479
• License:
• Abstract: Frequency-bin quantum encoding shows great promise for quantum communication given its high-dimensional scaling, compatibility with photonic integrated circuits and synergy with classical optical communication technology. However, to date all demonstrations have been performed over single-mode and static channels, while the transmission over fluctuating and turbulent channels has not been addressed. We propose and demonstrate a novel approach that leverages field-widened interferometers to decode frequency-bins transmitted over free-space channels without any adaptive optics or modal filtering. Moreover, we investigate the phase stability requirements so that frequency-bin encoding could be feasible for satellite to ground quantum links. Our passive approach expands the versatility of frequency-bin encoding, paving the way towards long-range and fluctuating channels.

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