Engineering Entanglement: The Fast-Approach Phase Gate

Details Engineering Entanglement: The Fast-Approach Phase Gate Engineering Entanglement: The Fast-Approach Phase Gate

2005-05-26

arxiv.org/abs/quant-ph/0505199v1

Phys. Rev. A72, 022325 (2005)

Physics

Quantum Physics

7 pages, 4 figures. Phys. Rev. A (in press)

Scientific paper

10.1103/PhysRevA.72.022325

Optimal-control techniques and a fast-approach scheme are used to implement a collisional control phase gate in a model of cold atoms in an optical lattice, significantly reducing the gate time as compared to adiabatic evolution while maintaining high fidelity. New objective functionals are given for which optimal paths are obtained for evolution that yields a control-phase gate up to single-atom Rabi shifts. Furthermore, the fast-approach procedure is used to design a path to significantly increase the fidelity of non-adiabatic transport in a recent experiment. Also, the entanglement power of phase gates is quantified.

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