Measurement-device-independent entanglement detection for continuous-variable systems
arXiv:2101.10778 · doi:10.1103/PhysRevLett.126.190502
Abstract
We study the detection of continuous-variable entanglement, for which most of the existing methods designed so far require a full specification of the devices, and we present protocols for entanglement detection in a scenario where the measurement devices are completely uncharacterised. We first generalise, to the continuous variable regime, the seminal results by Buscemi [PRL 108, 200401(2012)] and Branciard et al. [PRL 110, 060405 (2013)], showing that all entangled states can bedetected in this scenario. Most importantly, we then describe a practical protocol that allows for the measurement-device-independent certification of entanglement of all two-mode entangled Gaussian states. This protocol is feasible with current technology as it makes only use of standard optical setups such as coherent states and homodyne measurements.
arXiv commentAccepted in PRL
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- Verification of Continuous-Variable Quantum Memories
- Measurement-device-independent nonlinear entanglement witnesses
- Closing loopholes of measurement-device-independent nonlinear entanglement witnesses