Hybrid of superconducting quantum interference device and atomic Bose-Einstein condensate: An architecture for quantum information processing

TL;DR

This paper proposes a hybrid quantum system combining a Bose-Einstein condensate and a SQUID, enabling rapid qubit state transfer with high fidelity for quantum information processing.

Contribution

It introduces a novel architecture coupling BEC and SQUID via flux qubit quantum fields, enhancing transfer speed and fidelity for quantum computing applications.

Findings

Bosonic enhancement of Rabi frequency in BEC

High-fidelity qubit state transfer demonstrated

Quantum tomography protocol for transfer verification

Abstract

A hybrid quantum system is proposed by coupling the internal hyperfine transitions of a trapped atomic Bose-Einstein condensate (BEC) and a superconducting quantum interference device (SQUID) via the macroscopic quantum field of the flux qubit. The presence of the condensate leads to a bosonic enhancement of the Rabi frequency over the otherwise small single-particle magnetic dipole transition matrix elements. This enhancement allows for the possibility to rapidly transfer and store qubit states in the BEC that were originally prepared in the SQUID. The fidelity of this transfer for different states is calculated, and a direct experimental protocol to determine the transfer fidelity by quantum tomography of the BEC qubit is presented.