Quantum commutator with photonic interface and polarization quantum memory

In this paper, we propose module scheme of a quantum commutator for different photonic states based on combining photonic interface and polarization quantum memory. The Q-Commutator ensures the transformation and store of photonic states with reconfigurable time delay, which significantly facilitates the implementation of hybrid quantum networks. The interface module receiving photonic qubits with phase-frequency encoding transmits them to the input of memory module, converting them into polarization encoding. As a memory cell we use a polarization quantum memory consisting of a small number of high-quality WGM ring resonators capable of storing a wideband multi-frequency signal. The proposed configuration has low noise and can be used to build a quantum repeater and distributed sensor systems.