Fidelity estimation between two finite ensembles of unknown pure equatorial qubit states
Suppose, we are given two finite ensembles of pure qubit states, so that the qubits in each ensemble are prepared in identical (but unknown for us) states lying on the equator of the Bloch sphere. What is the best strategy to estimate fidelity between these two finite ensembles of qubit states? We d...
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| Main Author: | |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
27 July 2011
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| In: |
Physics letters
Year: 2011, Volume: 375, Issue: 38, Pages: 3340-3342 |
| ISSN: | 1873-2429 |
| DOI: | 10.1016/j.physleta.2011.07.037 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physleta.2011.07.037 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0375960111009091 
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| Author Notes: | Michael Siomau |
MARC
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| 520 | |a Suppose, we are given two finite ensembles of pure qubit states, so that the qubits in each ensemble are prepared in identical (but unknown for us) states lying on the equator of the Bloch sphere. What is the best strategy to estimate fidelity between these two finite ensembles of qubit states? We discuss three possible strategies for the fidelity estimation. We show that the best strategy includes two stages: a specific unitary transformation on two ensembles and state estimation of the output states of this transformation. | ||
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