Experimentally obtaining the Likeness of Two Unknown Quantum States on an NMR Quantum Information Processor

Details Experimentally obtaining the Likeness of Two Unknown Quantum States on an NMR Quantum Information Processor Experimentally obtaining the Likeness of Two Unknown Quantum States on an NMR Quantum Information Processor

2002-04-09

arxiv.org/abs/quant-ph/0204049v4

Chin. Phys. Lett. 2003, vol.20 No.10 p1669

Physics

Quantum Physics

3 pages, 4 figures

Scientific paper

10.1088/0256-307X/20/10/304

Recently quantum states discrimination has been frequently studied. In this paper we study them from the other way round, the likeness of two quantum states. The fidelity is used to describe the likeness of two quantum states. Then we presented a scheme to obtain the fidelity of two unknown qubits directly from the integral area of the spectra of the assistant qubit(spin) on an NMR Quantum Information Processor. Finally we demonstrated the scheme on a three-qubit quantum information processor. The experimental data are consistent with the theoretical expectation with an average error of 0.05, which confirms the scheme.

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