期刊
PHYSICAL REVIEW A
卷 87, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.030102
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资金
- US National Science Foundation [PHY -0903692, 0903930, 0903953]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0903953, 0903930, 1212445] Funding Source: National Science Foundation
The need to perform quantum state tomography on ever-larger systems has spurred a search for methods that yield good estimates from incomplete data. We study the performance of compressed sensing (CS) and least squares (LS) estimators in a fast protocol based on continuous measurement on an ensemble of cesium atomic spins. They both efficiently reconstruct nearly pure states in the 16-dimensional ground manifold, reaching average fidelities (F) over bar (CS) = 0.92 and (F) over bar (LS) = 0.88 using similar amounts of incomplete data. Surprisingly, the main advantage of CS in our protocol is an increased robustness to experimental imperfections. DOI: 10.1103/PhysRevA.87.030102
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