Verification of Continuous-Variable Quantum Memories
arXiv:2305.07513 · doi:10.1088/2058-9565/ad097c
Abstract
A proper quantum memory is argued to consist in a quantum channel which cannot be simulated with a measurement followed by classical information storage and a final state preparation, i.e. an entanglement breaking (EB) channel. The verification of quantum memories (non-EB channels) is a task in which an honest user wants to test the quantum memory of an untrusted, remote provider. This task is inherently suited for the class of protocols with trusted quantum inputs, sometimes called measurement-device-independent (MDI) protocols. Here, we study the MDI certification of non-EB channels in continuous variable (CV) systems. We provide a simple witness based on adversarial metrology, and describe an experimentally friendly protocol that can be used to verify all non Gaussian incompatibility breaking quantum memories. Our results can be tested with current technology and can be applied to test other devices resulting in non-EB channels, such as CV quantum transducers and transmission lines.
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- Thermodynamic Approach to Quantifying Incompatible Instruments
- Entropic witness for quantum memory in open system dynamics
- Entanglement-breaking channels are a quantum memory resource
- Verifying Quantum Memory in the Dynamics of Spin Boson Models
- Complete characterisation of state conversions by work extraction
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