Abstract
We present a device-independent protocol to test if a given black-box measurement device is entangled, that is, has entangled eigenstates. Our scheme involves three parties and is inspired by entanglement swapping; the test uses the Clauser-Horne-Shimony-Holt Bell inequality, checked between each pair of parties. In the case where all particles are qubits, we characterize quantitatively the deviation of the measurement device from a perfect Bell-state measurement.
Original language | English |
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Article number | 050502 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 107 |
Issue number | 5 |
DOIs | |
Publication status | Published - 25 Jul 2011 |
Keywords
- QUANTUM
- INEQUALITY
- VIOLATION
- THEOREM
- STATES