Experimental realization of direct entangling gates between dual-type qubits

Abstract

Dual-type qubits have become a promising way to suppress the crosstalk error of auxiliary operations in large-scale ion trap quantum computation. Here we demonstrate a direct entangling gate between dual-type qubits encoded in the $S_{1/2}$ and $D_{5/2}$ hyperfine manifolds of ${}^{137}{\mathrm{Ba}}^{+}$ ions. Our scheme is economic in the hardware, requiring only a single $532$nm laser system to entangle both qubit types by driving their Raman transitions. We achieve a Bell state fidelity of $96.3(4)\%$ for the dual-type Molmer-Sorensen gate between an $S$-$D$ ion pair, comparable to that for the same-type $S$-$S$ or $D$-$D$ gates. This technique can reduce the overhead for back-and-forth conversions between dual-type qubits in the quantum circuit with wide applications in quantum error correction and ion-photon quantum networks.

References in corpus (14)

• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• High-Fidelity Bell-State Preparation with ${}^{40}$Ca${}^{+}$ Optical Qubits
• Benchmarking a trapped-ion quantum computer with 30 qubits
• A Site-Resolved 2D Quantum Simulator with Hundreds of Trapped Ions
• $\text{omg}$ Blueprint for trapped ion quantum computing with metastable states
• Realizing coherently convertible dual-type qubits with the same ion species
• Demonstration of fault-tolerant Steane quantum error correction
• High fidelity state preparation and measurement of ion hyperfine qubits with I > 1/2
• Benchmarking a high-fidelity mixed-species entangling gate
• Memory coherence of a sympathetically cooled trapped-ion qubit
• The Character of Motional Modes for Entanglement and Sympathetic Cooling of Mixed-Species Trapped Ion Chains
• Synthesizing a ${\hat{\sigma }}_z$ spin-dependent force for optical, metastable, and ground state trapped-ion qubits
• Electromagnetically-Induced-Transparency Cooling of High-Nuclear-Spin Ions
• Eliminating qubit type cross-talk in the $\text{omg}$ protocol

Cited by in corpus (1)

• Spontaneous Raman scattering out of a metastable atomic qubit