Resonator-assisted quantum transduction between superconducting qubits and trapped atomic systems via Rydberg levels

TL;DR

This paper proposes a scheme for quantum transduction between superconducting qubits and atomic systems using a shared microwave resonator and Rydberg levels, analyzing two coupling protocols and their fidelities.

Contribution

It introduces a novel resonator-assisted transduction method employing Rydberg states and compares resonant and dispersive coupling protocols for quantum state transfer.

Findings

High transfer fidelity achievable in ideal conditions

Dispersive regime reduces decoherence effects

Performance depends on dissipation and decoherence sources

Abstract

Using a shared microwave resonator, we propose a transduction scheme between superconducting qubits and qubit states encoded in the low-lying internal levels of trapped atomic systems. The approach employs atomic Rydberg levels together with laser pulses that connect them to the low-lying qubit states. We explore two coupling protocols: one based on resonant interactions between the subsystems, and another operating in the dispersive regime, where the resonator is far detuned from the transition frequencies of the matter qubits. These protocols enable the transfer of a general qubit state from the superconducting qubit to the atomic qubit. Transfer fidelity is evaluated across different coupling regimes and under various sources of dissipation and decoherence, including resonator decay, Rydberg state decay, and both relaxation and pure dephasing of the superconducting qubit, providing a detailed assessment of the performance of the proposed scheme.