Projects per year
Abstract
Consider the task of verifying that a given quantum device, designed to produce a particular entangled state, does indeed produce that state. One natural approach would be to characterize the output state by quantum state tomography, or alternatively, to perform some kind of Bell test, tailored to the state of interest. We show here that neither approach is optimal among local verification strategies for 2-qubit states. We find the optimal strategy in this case and show that quadratically fewer total measurements are needed to verify to within a given fidelity than in published results for quantum state tomography, Bell test, or fidelity estimation protocols. We also give efficient verification protocols for any stabilizer state. Additionally, we show that requiring that the strategy be constructed from local, nonadaptive, and noncollective measurements only incurs a constant-factor penalty over a strategy without these restrictions.
Original language | English |
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Article number | 170502 |
Number of pages | 21 |
Journal | Physical Review Letters |
Volume | 120 |
Issue number | 17 |
Early online date | 24 Apr 2018 |
DOIs | |
Publication status | Published - 27 Apr 2018 |
Research Groups and Themes
- QITG
- Bristol Quantum Information Institute
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Dive into the research topics of 'Optimal Verification of Entangled States with Local Measurements'. Together they form a unique fingerprint.Projects
- 1 Finished
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New insights in quantum algorithms and complexity
Montanaro, A. M. R. (Principal Investigator)
31/07/14 → 30/06/20
Project: Research