Thermal States as Universal Resources for Quantum Computation with Always-on Interactions

Details Thermal States as Universal Resources for Quantum Computation with Always-on Interactions Thermal States as Universal Resources for Quantum Computation with Always-on Interactions

2011-02-25

arxiv.org/abs/1102.5153v2

Phys. Rev. Lett. 107, 060501 (2011)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.107.060501

Measurement-based quantum computation utilizes an initial entangled resource state and proceeds with subsequent single-qubit measurements. It is implicitly assumed that the interactions between qubits can be switched off so that the dynamics of the measured qubits do not affect the computation. By proposing a model spin Hamiltonian, we demonstrate that measurement-based quantum computation can be achieved on a thermal state with always-on interactions. Moreover, computational errors induced by thermal fluctuations can be corrected and thus the computation can be executed fault-tolerantly if the temperature is below a threshold value.

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