Assessment of a quantum phase gate operation based on nonlinear optics

Details Assessment of a quantum phase gate operation based on nonlinear optics Assessment of a quantum phase gate operation based on nonlinear optics

2006-05-11

arxiv.org/abs/quant-ph/0605100v2

Phys Rev A 74, 032301 (2006)

Physics

Quantum Physics

12 pages, 15 figures

Scientific paper

10.1103/PhysRevA.74.032301

We analyze in detail the proposal for a two-qubit gate for travelling single-photon qubits recently presented by C. Ottaviani \emph{et al}. [Phys. Rev. A \textbf{73}, 010301(R) (2006)]. The scheme is based on an ensemble of five-level atoms coupled to two quantum and two classical light fields. The two quantum fields undergo cross-phase modulation induced by electromagnetically induced transparency. The performance of this two-qubit quantum phase gate for travelling single-photon qubits is thoroughly examined in the steady-state and transient regimes, by means of a full quantum treatment of the system dynamics. In the steady-state regime, we find a general trade-off between the size of the conditional phase shift and the fidelity of the gate operation. However, this trade-off can be bypassed in the transient regime, where a satisfactory gate operation is found to be possible, significantly reducing the gate operation time.

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