Long-lived qubit from three spin-1/2 atoms

Details Long-lived qubit from three spin-1/2 atoms Long-lived qubit from three spin-1/2 atoms

2010-08-09

arxiv.org/abs/1008.1523v3

Physics

Quantum Physics

15 pages, 9 figures; version 2 reports a much improved analysis; version 3 contains more details about the four-atom case

Scientific paper

A system of three spin-1/2 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 $^6\textrm{Li}$ atoms trapped in a $\textrm{CO}_2$-laser-generated optical lattice and find that, with conservatively estimated parameters, a stored qubit maintains a fidelity of 0.9999 for two hours.

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