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InTech eBooks

Quantum Electrodynamics in Photonic Crystal Nanocavities towards Quantum Information Processing

Yun‐Feng Xiao, Xu‐Bo Zou, Qihuang Gong, Guang‐Can Guo, Chee Wei Wong

Published Jan 1, 2010• 1 citation
Publisher

Abstract

In this Chapter, with the nanocavities in photonic crystal, we theoretically introduce, derive, and demonstrate the robust implementation of a single spin-photon phase gate in a cavitydipole-cavity system. The conditions of accidental degeneracy are examined to enforce complete transfer, either in the forward transmission or in reflection, of the qubit. In addition, we observe that a photon pulse is strikingly reflected by a cavity interacting with a single spin, even under the bad-cavity limit. This combined nanocrystal-cavity system,

DOI
10.5772/6908

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In this Chapter, with the nanocavities in photonic crystal, we theoretically introduce, derive, and demonstrate the robust implementation of a single spin-photon phase gate in a cavitydipole-cavity system. The conditions of accidental degeneracy are examined to enforce complete transfer, either in the forward transmission or in reflection, of the qubit. In addition, we observe that a photon pulse is strikingly reflected by a cavity interacting with a single spin, even under the bad-cavity limit. This combined nanocrystal-cavity system,
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We show that a scalable photonic crystal nanocavity array, in which single embedded quantum dots are coherently interacting, can perform as an universal single-operation quantum gate. In a passive system, the optical analogue of electromagnetically-induced-transparency is observed. The presence of a single two-level system in the array dramatically controls the spectral lineshapes. When each cavity couples with a two-level system, our scheme achieves two-qubit gate operations with high fidelity and low photon loss, even in the bad cavity limit and with non-ideal detuning and decoherence.
Optical nanocavities enable a strong interaction between single photons and single emitters. An appealing application is the construction of a quantum interface for photonic and solid state qubits. Since the material of the solid state qubit is often dierent from the nanocavity, there has been considerable interest in combining the two in a hybrid architecture. We describe our recent development of such a hybrid interface based a Gallium Phosphide photonic crystal nanocavity that is scanned and deterministically coupled to single emitters on a surface. The technique is used to couple the cavity to the nitrogen vacancy center in diamond, an emitter system with optically accessible electron spins and the ability to transfer electronic spin states to nuclear spins.
Ultra-high-quality factor photonic crystal nanocavities are attracting much attention because they can confine light into an ultra-small region and enable strong interaction between light and matter. One important step toward the realization of quantum information processing with cavity quantum electrodynamics approaches is a robust method that transfers photons among such cavities. We propose and theoretically investigate a scheme to transfer photons between strongly coupled, distant photonic crystal nanocavities by an adiabatic change in the cavity characteristics in the time domain. Adding one intermediate nanocavity for control allows efficient light transfer between objective nanocavities. Because our scheme utilizes adiabatic transfer, its operation is robust for both the control parameters and the control timing.