Phys. Rev. Lett. 92, 147901 (2004) [4 pages]

Experimental Investigation of a Two-Qubit Decoherence-Free Subspace

Abstract

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J. B. Altepeter^1,2, P. G. Hadley², S. M. Wendelken², A. J. Berglund^2,*, and P. G. Kwiat^1,2,†
¹Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080, USA
²Physics Division, P-23, Los Alamos National Laboratories, Los Alamos, New Mexico 87545, USA

Received 31 May 2003; published 9 April 2004

We thoroughly explore the phenomenon of a decoherence-free subspace (DFS) for two-qubit systems. Specifically, we both collectively and noncollectively decohere entangled polarization-encoded two-qubit states using thick birefringent crystals. These results characterize the basis-dependent effect of decoherence on the four Bell states, the robustness of the DFS state against perturbations in the assumption of collective decoherence, and the existence of a DFS for each type of stable noncollective decoherence. Finally, we investigate the effects of collective and noncollective dissipation.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.92.147901

DOI:

10.1103/PhysRevLett.92.147901

PACS:

03.67.Pp, 03.65.Yz, 03.67.Lx, 42.50.Dv

^*Department of Physics, California Institute of Technology, Pasadena, CA 91125.

^†Electronic address: kwiat@uiuc.edu

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Phys. Rev. Lett. 92, 147901 (2004) [4 pages]

Experimental Investigation of a Two-Qubit Decoherence-Free Subspace