Thermal Equilibrium as an Initial State for Quantum Computation by NMR

Details Thermal Equilibrium as an Initial State for Quantum Computation by NMR Thermal Equilibrium as an Initial State for Quantum Computation by NMR

2007-05-11

arxiv.org/abs/0705.1676v1

Physics

Quantum Physics

including 4 figures

Scientific paper

10.1103/PhysRevA.78.022317

We present a method of using a nuclear magnetic resonance computer to solve the Deutsch-Jozsa problem in which: (1) the number of molecules in the NMR sample is irrelevant to the number of qubits available to an NMR quantum computer, and (2) the initial state is chosen to be the state of thermal equilibrium, thereby avoiding the preparation of pseudopure states and the resulting exponential loss of signal as the number of qubits increases. The algorithm is described along with its experimental implementation using four active qubits. As expected, measured spectra demonstrate a clear distinction between constant and balanced functions.

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