Decoherence in a N-qubit solid-state quantum computer

Details Decoherence in a N-qubit solid-state quantum computer Decoherence in a N-qubit solid-state quantum computer

2004-11-11

arxiv.org/abs/quant-ph/0411086v2

Phys. Rev. B 71, 195325 (2005)

Physics

Quantum Physics

11 pages

Scientific paper

10.1103/PhysRevB.71.195325

We investigate the decoherence process for a quantum register composed of N qubits coupled to an environment. We consider an environment composed of one common phonon bath and several electronic baths. This environment is relevant to the implementation of a charge based solid-state quantum computer. We explicitly compute the time evolution of all off-diagonal terms of the register's reduced density matrix. We find that in realistic configurations, "superdecoherence" and "decoherence free subspaces" do not exist for an N-qubit system. This means that all off-diagonal terms decay like exp(-q(t)N), where q(t) is of the same order as the decay function of a single qubit.

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