Deterministic photon-photon (SWAP)^{1/2} gate using a lambda system
Kazuki Koshino, Satoshi Ishizaka, and Yasunobu Nakamura
TL;DR
This paper proposes a passive, deterministic method to implement a photon-photon (SWAP)^{1/2} gate using a lambda system, enabling scalable quantum computation without active control.
Contribution
It introduces a novel passive lambda-system-based approach for a deterministic photon-photon entangling gate suitable for scalable quantum computing.
Findings
The lambda system acts as a passive memory for photonic qubits.
The method does not require active control during gate operation.
The gate is suitable for scalable quantum computation.
Abstract
We theoretically present a method to realize a deterministic photon-photon (SWAP)^{1/2} gate using a three-level lambda system interacting with single photons in reflection geometry. The lambda system is used completely passively as a temporary memory for a photonic qubit; the initial state of the lambda system may be arbitrary, and active control by auxiliary fields is unnecessary throughout the gate operations. These distinct merits make this entangling gate suitable for deterministic and scalable quantum computation.
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