Security enhanced memory for quantum state

Security enhanced memory for quantum state

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Abstract Security enhancement is important click here in terms of both classical and quantum information.The recent development of a quantum storage device is noteworthy, and a coherence time of one second or longer has been demonstrated.On the other hand, although the encryption of a quantum bit or quantum memory has been proposed theoretically, no experiment has yet been carried out.Here we report the demonstration of a quantum memory with an encryption function that is realized by scrambling and retrieving the recorded quantum phase.We developed two independent Ramsey interferometers on an atomic ensemble trapped below a persistent supercurrent atom chip.

By operating the two interferometers with random phases, the quantum phase recorded by a pulse of the first interferometer was modulated by the second interferometer pulse.The 2006 nissan altima radio scrambled quantum phase was restored by employing another pulse of the second interferometer with a specific time delay.This technique paves way for improving the security of quantum information technology.