Quantum Phase Gate Operation Based on Nonlinear Optics: Full Quantum Analysis

Details Quantum Phase Gate Operation Based on Nonlinear Optics: Full Quantum Analysis Quantum Phase Gate Operation Based on Nonlinear Optics: Full Quantum Analysis

2005-07-14

arxiv.org/abs/quant-ph/0507137v2

Phys. Rev. A 73, 010301(R) (2006)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.73.010301

We present a full quantum treatment of a five-level atomic system coupled to two quantum and two classical light fields. The two quantum fields undergo a cross-phase modulation induced by electro-magnetically induced transparency. The performance of this configuration as a two-qubit quantum phase gate for travelling single-photons is examined. A trade-off between the size of the conditional phase shift and the fidelity of the gate is found. Nonetheless, a satisfactory gate performance is still found to be possible in the transient regime, corresponding to a fast gate operation.

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