Separable Measurement Estimation of Density Matrices and its Fidelity Gap with Collective Protocols

Details Separable Measurement Estimation of Density Matrices and its Fidelity Gap with Collective Protocols Separable Measurement Estimation of Density Matrices and its Fidelity Gap with Collective Protocols

2005-12-21

arxiv.org/abs/quant-ph/0512177v3

Phys. Rev. Lett. 97, 130501 (2006)

Physics

Quantum Physics

version published in PRL

Scientific paper

10.1103/PhysRevLett.97.130501

We show that there exists a gap between the performance of separable and collective measurements in qubit mixed-state estimation that persists in the large sample limit. We characterize such gap in terms of the corresponding bounds on the mean fidelity. We present an adaptive protocol that attains the separable-measurement bound. This (optimal separable) protocol uses von Neumann measurements and can be easily implemented with current technology.

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