Individual Addressing in Quantum Computation through Spatial Refocusing

Abstract

Separate addressing of individual qubits is a challenging requirement for scalable quantum computation, and crosstalk between operations on neighboring qubits remains as a significant source of noise for current experimental implementation of multi-qubit platforms. We propose a scheme based on spatial refocusing from interference of several coherent laser beams to significantly reduce the crosstalk noise for any type of quantum gates. A general framework is developed for the spatial refocusing technique, in particular with practical Gaussian beams, and we show under typical experimental conditions, the crosstalk-induced infidelity of quantum gates can be reduced by several orders of magnitude with a moderate cost of a few correction laser beams.

7 pages, 4 figures

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Cited by in corpus (9)

• Optimal quantum control of multi-mode couplings between trapped ion qubits for scalable entanglement
• A trapped-ion based quantum byte with $10^{-5}$ next-neighbour cross-talk
• Simulating the performance of a distance-3 surface code in a linear ion trap
• Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer
• Transformed Composite Sequences for Improved Qubit Addressing
• Quantum imaging by coherent enhancement
• First-Order Crosstalk Mitigation in Parallel Quantum Gates Driven With Multi-Photon Transitions
• Heisenberg scaling of imaging resolution by coherent enhancement
• Crosstalk Insensitive Trapped-Ion Entanglement through Coupling Matrix Engineering