Experimental Quantification of Coherence of a Tunable Quantum Detector.
- Publisher:
- American Physical Society (APS)
- Publication Type:
- Journal Article
- Citation:
- Physical review letters, 2020, 125, (6), pp. 060404
- Issue Date:
- 2020-08
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| PhysRevLett.125.060404.pdf | Published version | 476.21 kB |
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Quantum coherence is a fundamental resource that quantum technologies exploit to achieve performance beyond that of classical devices. A necessary prerequisite to achieve this advantage is the ability of measurement devices to detect coherence from the measurement statistics. Based on a recently developed resource theory of quantum operations, here we quantify experimentally the ability of a typical quantum-optical detector, the weak-field homodyne detector, to detect coherence. We derive an improved algorithm for quantum detector tomography and apply it to reconstruct the positive-operator-valued measures of the detector in different configurations. The reconstructed positive-operator-valued measures are then employed to evaluate how well the detector can detect coherence using two computable measures. As the first experimental investigation of quantum measurements from a resource theoretical perspective, our work sheds new light on the rigorous evaluation of the performance of a quantum measurement apparatus.
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