Resource-efficient dissipative entanglement of two trapped-ion qubits

TL;DR

This paper presents a faster, higher-fidelity method for dissipatively entangling two trapped-ion qubits without auxiliary ions, achieving a singlet state in about 7 ms with nearly 95% fidelity.

Contribution

It introduces a simplified, resource-efficient approach to dissipative entanglement generation that outperforms previous methods in speed and fidelity.

Findings

Entangled state generated in ~7 ms

Fidelity of 0.949 achieved

Photon scattering identified as main infidelity source

Abstract

We demonstrate a simplified method for dissipative generation of an entangled state of two trapped-ion qubits. Our implementation produces its target state faster and with higher fidelity than previous demonstrations of dissipative entanglement generation and eliminates the need for auxiliary ions. The entangled singlet state is generated in $\sim$7 ms with a fidelity of 0.949(4). The dominant source of infidelity is photon scattering. We discuss this error source and strategies for its mitigation.