Multi-resonator random access quantum memory with integrated magnet-less circulator

Abstract

The technology described herein is directed towards a multi-bit random-access quantum memory (RAQM) system based on reconfigurable tunable resonators. The RAQM system includes an array of (e.g., four) tunable high-Q resonators which, when one is tuned to the same frequency as a common (shared) broadband tunable low quality resonator, strongly interact to write a qubit to the high-Q resonators, and similarly readout a previously stored qubit. The shared low-Q and multiple high-Q resonators can be fabricated in a monolithically-integrated stack, without consuming a large circuit footprint or chip area. The low-Q resonator can be coupled to an external feed-line to obtain the qubits through a circulator, facilitating efficient read/write operations from and to the quantum memory storage portion of the RAQM system. In one implementation, the circulator is a magnet-less circulator, facilitating deployment of the RAQM system at cryogenic temperatures.