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. with 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.

中文翻译：

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连续可变量子存储器的验证


正确的量子存储器被认为是由一个量子通道组成，该通道无法通过测量、随后的经典信息存储和最终状态准备来模拟，即使用纠缠破坏（EB）通道。量子存储器（非 EB 通道）的验证是一项诚实用户想要测试不受信任的远程提供商的量子存储器的任务。此任务本质上适合具有可信量子输入的协议类，有时称为独立于测量设备 (MDI) 协议。在这里，我们研究连续变量 (CV) 系统中非 EB 通道的 MDI 认证。我们提供了一个基于对抗性计量学的简单见证，并描述了一种实验友好的协议，可用于验证所有非高斯不兼容破坏量子存储器。我们的结果可以使用当前技术进行测试，并且可以应用于测试其他产生非 EB 通道的设备，例如 CV 量子传感器和传输线。