Passive and Deterministic Controlled-phase Gate for Single-photon Wavepackets Based on Time-reversal Symmetric Photon Transport

• URL: http://arxiv.org/abs/2312.10719v4
• Date: Thu, 4 Apr 2024 04:01:16 GMT
• Title: Passive and Deterministic Controlled-phase Gate for Single-photon Wavepackets Based on Time-reversal Symmetric Photon Transport
• Authors: Zhaohua Tian, Xue-Wen Chen,
• Abstract summary: The proposed gate is rooted in the concept of time-reversal symmetric photon transport. It can circumvent the longstanding issue of wavepacket distortion inherent in photonic phase gates employing nonlinear media. The gate fidelity can exceed 99% for a node with only four cavities for both single-photon and two-photon operations.
• Score: 0.6813925418351434
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report the construction of a passive, deterministic and near-unity-fidelity controlled-$\pi$-phase gate for single-photon wavepackets with a node comprising a two-level emitter and a small number of cavities. The proposed gate is rooted in the concept of time-reversal symmetric photon transport, which makes the entire photon transport process into a perfect absorption and re-emission process. Consequently, it can circumvent the longstanding issue of wavepacket distortion inherent in photonic phase gates employing nonlinear media. Moreover, such time-reversal symmetric transport ensures the nonlinear $\pi$ phase shift by a single two-level emitter for the two-photon case. We develop analytical solutions to reveal the temporal dynamics of the nonlinear photon transport and to optimize the gate structure. Notably, the gate fidelity can exceed 99\% for a node with only four cavities for both single-photon and two-photon operations. Moreover, the proposed gate architecture is compatible with the platforms of integrated photonics.

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