Arbitrary-speed quantum gates within large ion crystals through minimum control of laser beamsShi-Liang Zhu, C. Monroe and L.-M. Duan
FOCUS center and MCTP, Department of Physics, University of Michigan Ann Arbor, MI 48109, USA
received 10 November 2005; accepted in final form 15 December 2005
published online 6 January 2006
We propose a scheme to implement arbitrary-speed quantum entangling gates on two trapped ions immersed in a large linear crystal of ions, with minimal control of laser beams. For gate speeds slower than the oscillation frequencies in the trap, a single appropriately detuned laser pulse is sufficient for high-fidelity gates. For gate speeds comparable to or faster than the local ion oscillation frequency, we discover a five-pulse protocol that exploits only the local phonon modes. This points to a method for efficiently scaling the ion trap quantum computer without shuttling ions.
03.67.Lx - Quantum computation.
03.67.Pp - Quantum error correction and other methods for protection against decoherence.
32.80.Qk - Coherent control of atomic interactions with photons.
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