Optimal entanglement-assisted discrimination of quantum measurements
arXiv:1408.0940 · doi:10.1103/PhysRevA.90.022317
Abstract
We investigate optimal discrimination between two projective single-qubit measurements in a scenario where the measurement can be performed only once. We consider general setting involving a tunable fraction of inconclusive outcomes and we prove that the optimal discrimination strategy requires an entangled probe state for any nonzero rate of inconclusive outcomes. We experimentally implement this optimal discrimination strategy for projective measurements on polarization states of single photons. Our setup involves a real-time electrooptical feed-forward loop which allows us to fully harness the benefits of entanglement in discrimination of quantum measurements. The experimental data clearly demonstrate the advantage of entanglement-based discrimination strategy as compared to unentangled single-qubit probes.
arXiv comment7 pages, 6 figures
References in corpus (32)
- Theoretical framework for quantum networks
- Quantum Circuits Architecture
- Transforming quantum operations: quantum supermaps
- Statistical distinguishability between unitary operations
- Using entanglement improves precision of quantum measurements
- Optimal discrimination of quantum operations
- Unambiguous state discrimination in quantum cryptography with weak coherent states
- Memory effects in quantum channel discrimination
- All entangled states are useful for channel discrimination
- Experimental Demonstration of Optimal Unambiguous State Discrimination
- The Perfect Distinguishability of Quantum Operations
- Optimal discrimination of mixed quantum states involving inconclusive results
- Unambiguous discrimination among quantum operations
- Adaptive versus non-adaptive strategies for quantum channel discrimination
- Quantum multimeters: A programmable state discriminator
- Process POVM: A mathematical framework for the description of process tomography experiments
- General Strategies for Discrimination of Quantum States
- Optimal discrimination of quantum states with a fixed rate of inconclusive outcomes
- State discrimination with error margin and its locality
- Identification and Distance Measures of Measurement Apparatus
- Discrimination with error margin between two states - Case of general occurrence probabilities -
- Experimental implementation of unambiguous quantum reading
- Experimental Quantum Process Discrimination
- Programmable discriminator of coherent states - experimental realization
- Increasing efficiency of a linear-optical quantum gate using an electronic feed forward
- Single-shot discrimination of quantum unitary processes
- Discrimination of quantum observables using limited resources
- Experimental realization of a programmable quantum-state discriminator and a phase-covariant quantum multimeter
- Optimal two-copy discrimination of quantum measurements
- Identification of a reversible quantum gate: assessing the resources
- Linear-Optical Implementation of Perfect Discrimination between Single-bit Unitary Operations
- Unitary-process discrimination with error margin