A high fidelity light-shift gate for clock-state qubits

Abstract

To date, the highest fidelity quantum logic gates between two qubits have been achieved with variations on the geometric-phase gate in trapped ions, with the two leading variants being the Molmer-Sorensen gate and the light-shift (LS) gate. Both of these approaches have their respective advantages and challenges. For example, the latter is technically simpler and is natively insensitive to optical phases, but it has not been made to work directly on a clock-state qubit. We present a new technique for implementing the LS gate that combines the best features of these two approaches: By using a small ($\sim \mathrm{MHz}$) detuning from a narrow (dipole-forbidden) optical transition, we are able to operate an LS gate directly on hyperfine clock states, achieving gate fidelities of $99.74(4)\%$ using modest laser power at visible wavelengths. Current gate infidelities appear to be dominated by technical noise, and theoretical modeling suggests a path towards gate fidelity above $99.99\%$.

4+ pages, 3 figures, and supplemental material

References in corpus (15)

• Surface codes: Towards practical large-scale quantum computation
• Quantum computation with ions in thermal motion
• High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions
• High-fidelity quantum logic gates using trapped-ion hyperfine qubits
• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• High-Fidelity Universal Gate Set for ${}^9$Be${}^{+}$ Ion Qubits
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Long-lived qubit memory using atomic ions
• Phase Control of Trapped Ion Quantum Gates
• Triangular color codes on trivalent graphs with flag qubits
• Laser-induced charging of microfabricated ion traps
• Geometric phase gate on an optical transition for ion trap quantum computation
• Eliminating Leakage Errors in Hyperfine Qubits
• Subspace benchmarking high-fidelity entangling operations with trapped ions
• High-fidelity ion-trap quantum computing with hyperfine clock states

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