Universal Leakage Elimination

Details Universal Leakage Elimination Universal Leakage Elimination

2004-09-08

arxiv.org/abs/quant-ph/0409049v2

Phys. Rev. A 71, 052301 (2005)

Physics

Quantum Physics

14 pages, no figures, new version has references updated/fixed

Scientific paper

10.1103/PhysRevA.71.052301

``Leakage'' errors are particularly serious errors which couple states within a code subspace to states outside of that subspace thus destroying the error protection benefit afforded by an encoded state. We generalize an earlier method for producing leakage elimination decoupling operations and examine the effects of the leakage eliminating operations on decoherence-free or noiseless subsystems which encode one logical, or protected qubit into three or four qubits. We find that by eliminating the large class of leakage errors, under some circumstances, we can create the conditions for a decoherence free evolution. In other cases we identify a combination decoherence-free and quantum error correcting code which could eliminate errors in solid-state qubits with anisotropic exchange interaction Hamiltonians and enable universal quantum computing with only these interactions.

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