Quantum information processing with a single photon by input-output process regarding low-Q cavities

Abstract

Both cavity QED and photons are promising candidates for quantum information processing. We consider a combination of both candidates with a single photon going through spatially separate cavities to entangle the atomic qubits, based on the input-output process of the cavities. We present a general expression for the input-output process regarding the low-Q cavity confining a single atom, which works in a wide range of parameters. Focusing on low-Q cavity case, we propose some schemes for quantum information processing with Faraday rotation using single photons, which is much different from the high-Q cavity and strong coupling cases.

7 pages, 3 figures. Accepted by PRA

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• Error-heralded generation and self-assisted complete analysis of two-photon hyperentangled Bell states assisted by single-sided quantum-dot-cavity systems
• Implementing two-photon three-degree-of-freedom hyper-parallel controlled phase flip gate through cavity-assisted interactions
• Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates
• "Modes of the universe" study of two-photon deterministic, passive quantum logical gates
• Heralded entangling quantum gate via cavity-assisted photon scattering
• Single-photon, cavity-mediated gates: detuning, losses, and non-adiabatic effects
• Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities
• Implementations of two-photon four-qubit Toffoli and Fredkin gates assisted by nitrogen-vacancy centers
• Dark-state and loss-induced phenomena in the quantum-optical regime of $\Lambda$-type three-level systems
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• Atomic entanglement purification using photonic Faraday rotation
• Multipartite entanglement purification for three-level trapped atom systems
• Steady states of $\Lambda$-type three-level systems excited by quantum light in lossy cavities
• Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities