Enhanced Quantum Estimation via Purification

Details Enhanced Quantum Estimation via Purification Enhanced Quantum Estimation via Purification

2000-04-25

arxiv.org/abs/quant-ph/0004096v1

Phys. Rev. A 62, 042301 (2000)

Physics

Quantum Physics

6 pages, including 3 figures

Scientific paper

10.1103/PhysRevA.62.042301

We analyze the estimation of a finite ensemble of quantum bits which have been sent through a depolarizing channel. Instead of using the depolarized qubits directly, we first apply a purification step and show that this improves the fidelity of subsequent quantum estimation. Even though we lose some qubits of our finite ensemble the information is concentrated in the remaining purified ones.

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