Hyperparallel transistor, router and dynamic random access memory with unity fidelities

TL;DR

This paper proposes theoretically designed hyperparallel optical quantum devices, including a transistor, router, and DRAM, utilizing polarization and spatial degrees of freedom to enhance efficiency, capacity, and robustness against imperfections.

Contribution

It introduces novel hyperparallel quantum optical elements that achieve unity fidelity considering real-world imperfections, advancing quantum information processing capabilities.

Findings

Unity fidelities achieved despite side leakage and birefringence.

Hyperparallel design enhances channel capacity and resource efficiency.

Robust schemes effective against cavity imperfections.

Abstract

We theoretically implement some hyperparallel optical elements, including quantum single photon transistor, router, and dynamic random access memory (DRAM). The inevitable side leakage and the imperfect birefringence of the quantum dot (QD)-cavity mediates are taken into account, and unity fidelities of our optical elements can be achieved. The hyperparallel constructions are based on polarization and spatial degrees of freedom (DOFs) of the photon to increase the parallel efficiency, improve the capacity of channel, save the quantum resources, reduce the operation time, and decrease the environment noises. Moreover, the practical schemes are robust against the side leakage and the coupling strength limitation in the microcavities.