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Phys. Rev. A 77, 012329 (2008) [8 pages]

Three-qubit phase gate based on cavity quantum electrodynamics

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Jun-Tao Chang
Institute for Quantum Studies and Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA and Applied Physics and Materials Science Group, Eng. Quad., Princeton University, Princeton, New Jersey 08544, USA

M. Suhail Zubairy
Institute for Quantum Studies and Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA and Texas A&M University at Qatar, Education City, P. O. Box 23874, Doha, Qatar

Received 7 March 2007; published 23 January 2008

We describe a three-qubit quantum phase gate which is implemented by passing a four-level atom in a cascade configuration initially in its ground state through a three-mode optical cavity. The three qubits are represented by the photons in the three modes of the cavity. Under appropriate detunings, coupling coefficients, and interaction times, this system exhibits like a three-qubit quantum phase gate. Such a quantum phase gate has potential applications in quantum search.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.012329
DOI:
10.1103/PhysRevA.77.012329
PACS:
03.67.Lx, 42.50.Ct, 42.50.Dv
 
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