Entanglement Is Not Necessary for Perfect Discrimination between Unitary Operations

Details Entanglement Is Not Necessary for Perfect Discrimination between Unitary Operations Entanglement Is Not Necessary for Perfect Discrimination between Unitary Operations

2006-01-22

arxiv.org/abs/quant-ph/0601150v5

Physical Review Letters, vol. 98, no. 10, art. 100503, 2007

Physics

Quantum Physics

4 pages(in Revtex4), 2 figures (eps). Corrected some typos and two equations. Main results unchanged. Essentially the journal

Scientific paper

10.1103/PhysRevLett.98.100503

We show that a unitary operation (quantum circuit) secretely chosen from a finite set of unitary operations can be determined with certainty by sequentially applying only a finite amount of runs of the unknown circuit. No entanglement or joint quantum operations is required in our scheme. We further show that our scheme is optimal in the sense that the number of the runs is minimal when discriminating only two unitary operations.

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