A superconducting qubit as a quantum transformer routing entanglement between a microscopic quantum memory and a macroscopic resonator

TL;DR

This paper demonstrates an experimental entanglement between a microscopic defect-based two-level system and a macroscopic superconducting resonator, mediated by a superconducting qubit, highlighting potential for quantum memory integration.

Contribution

It introduces a method to entangle microscopic quantum memories with macroscopic resonators using a superconducting qubit as a quantum transformer.

Findings

Longer dephasing time of microscopic defect compared to the qubit

Entangled states have significantly longer coherence than the qubit

Potential for connecting low-decoherence memories to circuit QED systems

Abstract

We demonstrate experimentally the creation and measurement of an entangled state between a microscopic two level system and a macroscopic superconducting resonator where their indirect interaction is mediated by an artificial atom, a superconducting persistent current qubit (PCQB). We show that the microscopic two level system, formed by a defect in an oxide layer, exhibits an order of magnitude longer dephasing time than the PCQB, while the dephasing time of the entangled states between the microscopic two level system and macroscopic superconducting resonator is significantly longer than the dephasing time in the persistent current qubits. This demonstrates the possibility that a qubit of moderate coherence properties can be used in practice to address low decoherence quantum memories by connecting them to macroscopic circuit QED quantum buses, leading future important implications for quantum information processing tasks.