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Title: Long-lived qubit from three spin-12 atoms
Authors: Han, R.
Lörch, N.
Suzuki, J.
Englert, B.-G. 
Issue Date: 19-Jul-2011
Citation: Han, R., Lörch, N., Suzuki, J., Englert, B.-G. (2011-07-19). Long-lived qubit from three spin-12 atoms. Physical Review A - Atomic, Molecular, and Optical Physics 84 (1) : -. ScholarBank@NUS Repository.
Abstract: A system of three spin-12 atoms allows the construction of a reference-frame-free (RFF) qubit in the subspace with total angular momentum j=1/2. The RFF qubit stays coherent perfectly as long as the spins of the three atoms are affected homogeneously. The inhomogeneous evolution of the atoms causes decoherence, but this decoherence can be suppressed efficiently by applying a bias magnetic field of modest strength perpendicular to the plane of the atoms. The resulting lifetime of the RFF qubit can be many days, making RFF qubits of this kind promising candidates for quantum information storage units. Specifically, we examine the situation of three 6Li atoms trapped in a CO 2-laser-generated optical lattice and find that, with conservatively estimated parameters, a stored qubit maintains a fidelity of 0.9999 for two hours. © 2011 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.84.012322
Appears in Collections:Staff Publications

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