Universal measurement apparatus controlled by quantum software

Details Universal measurement apparatus controlled by quantum software Universal measurement apparatus controlled by quantum software

2002-02-26

arxiv.org/abs/quant-ph/0202152v2

Phys. Rev. Lett. 89, 190401 (2002).

Physics

Quantum Physics

4 pages, 2 figures, reference added

Scientific paper

10.1103/PhysRevLett.89.190401

We propose a quantum device that can approximate any projective measurement on a qubit. The desired measurement basis is selected by the quantum state of a "program register". The device is optimized with respect to maximal average fidelity (assuming uniform distribution of measurement bases). An interesting result is that if one uses two qubits in the same state as a program the average fidelity is higher than if he/she takes the second program qubit in the orthogonal state (with respect to the first one). The average information obtainable by the proposed measurements is also calculated and it is shown that it can get different values even if the average fidelity stays constant. Possible experimental realization of the simplest proposed device is presented.

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