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How to keep a qubit alive

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If you have a question about this talk, please contact Joe Bhaseen .

I consider a quantum spin-1/2, arbitrarily coupled to its environment, evolving deterministically under a time-dependent magnetic field B(t). I show that one can choose the time-dependence so that decoherence effects are minimized, in the sense that over a finite time interval T, transition rates between different states of the qubit can be suppressed to any desired order in T. Moreover the optimal protocol is independent of the details of the interaction hamiltonian and the state of the environment. This is joint work with D Dhar, based on work by Uhrig [Phys. Rev. Lett, 98, 100504 (2007)] and by Yang and Liu arXiv:0807.4058.

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