First-Order Crosstalk Mitigation in Parallel Quantum Gates Driven With Multi-Photon Transitions

Abstract

We demonstrate an order of magnitude reduction in the sensitivity to optical crosstalk for neighboring trapped-ion qubits during simultaneous single-qubit gates driven with individual addressing beams. Gates are implemented via two-photon Raman transitions, where crosstalk is mitigated by offsetting the drive frequencies for each qubit to avoid first-order crosstalk effects from inter-beam two-photon resonance. The technique is simple to implement, and we find that phase-dependent crosstalk due to optical interference is reduced on the most impacted neighbor from a maximal fractional rotation error of 0.185(4) without crosstalk mitigation to $\le$ 0.006 with the mitigation strategy. Further, we characterize first-order crosstalk in the two-qubit gate and avoid the resulting rotation errors for the arbitrary-axis Mølmer-Sørensen gate via a phase-agnostic composite gate. Finally, we demonstrate holistic system performance by constructing a composite CNOT gate using the improved single-qubit gates and phase-agnostic two-qubit gate. This work is done on the Quantum Scientific Computing Open User Testbed (QSCOUT); however, our methods are widely applicable for individual-addressing Raman gates and impose no significant overhead, enabling immediate improvement for quantum processors that incorporate this technique.

References in corpus (28)

• Polynomial-Time Algorithms for Prime Factorization and Discrete Logarithms on a Quantum Computer
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Quantum computation with ions in thermal motion
• Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Ion-trap quantum logic using long-wavelength radiation
• Resilient Quantum Computation: Error Models and Thresholds
• Detecting crosstalk errors in quantum information processors
• Parallel Entangling Operations on a Universal Ion Trap Quantum Computer
• Multi-Element Logic Gates for Trapped-Ion Qubits
• Phase Control of Trapped Ion Quantum Gates
• Suppression of crosstalk in superconducting qubits using dynamical decoupling
• Trapped-ion quantum logic with global radiation fields
• Entanglement of Trapped-Ion Clock States
• Basic circuit compilation techniques for an ion-trap quantum machine
• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• A trapped-ion based quantum byte with $10^{-5}$ next-neighbour cross-talk
• Quantum crosstalk cancellation for fast entangling gates and improved multi-qubit performance
• Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions
• Implementing Fault-tolerant Entangling Gates on the Five-qubit Code and the Color Code
• Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer
• Engineering the Quantum Scientific Computing Open User Testbed (QSCOUT): Design details and user guide
• Subspace benchmarking high-fidelity entangling operations with trapped ions
• Beat note stabilization of mode-locked lasers for quantum information processing
• Trapped-Ion Quantum Logic Utilizing Position-Dependent ac Stark Shifts
• Control and mitigation of microwave crosstalk effect with superconducting qubits
• Addressing atoms in optical lattices with Bessel beams
• Individual Addressing in Quantum Computation through Spatial Refocusing

Cited by in corpus (3)

• Design and characterization of individual addressing optics based on multi-channel acousto-optic modulator for ${}^{171}$Yb${}^{+}$ qubits
• Realization and Calibration of Continuously Parameterized Two-Qubit Gates on a Trapped-Ion Quantum Processor
• Noise-Aware Circuit Compilations for a Continuously Parameterized Two-Qubit Gateset