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Detection Loophole in Bell experiments: How post-selected local correlations can look non-local
Detection Loophole Bell experiments non-local
2010/10/29
A common problem in Bell type experiments is the well-known detection loophole: if the detection efficiencies are not perfect and if one simply post-selects the conclusive events, one might observe a...
Extremal Quantum Correlations and Cryptographic Security
Extremal Quantum Correlations Cryptographic Security
2010/10/29
We investigate fundamental properties of device independent security in quantum cryptography and show a one-to-one correspondence between extremal and secure probability distributions. This allows us ...
Optimal measurements to access classical correlations of two-qubit states
Optimal measurements classical correlations two-qubit states
2010/10/19
We analyze the optimal measurements accessing classical correlations in arbitrary two-qubit states.Two-qubit states can be transformed into the canonical forms via local unitary operations. For the ca...