Quantum Crosstalk Robust Quantum Control

Abstract

The prevalence of quantum crosstalk in current quantum devices poses challenges for achieving high-fidelity quantum logic operations and reliable quantum processing. Through quantum control theory, we develop an analytical condition for achieving crosstalk-robust single-qubit control of multi-qubit systems. We examine the effects of quantum crosstalk via a cumulant expansion and develop a condition to suppress the leading order contributions to the dynamics. The efficacy of the condition is illustrated in the domains of quantum state preservation and noise characterization through the development of crosstalk-robust dynamical decoupling and quantum noise spectroscopy (QNS) protocols. Using the IBM Quantum Experience, crosstalk-robust state preservation is demonstrated on 27 qubits, where a $3\times$ improvement in coherence decay is observed for single-qubit product and multipartite entangled states. Through the use of noise injection, we experimentally demonstrate crosstalk-robust dephasing QNS on a seven qubit processor, where a $10^4$ improvement in reconstruction accuracy over ``cross-susceptible" alternatives is found. Together, these experiments highlight the significant impact the crosstalk mitigation condition can have on improving multi-qubit characterization and control on current quantum devices.

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• Suppressing Correlated Noise in Quantum Computers via Context-Aware Compiling
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• SPAM-Robust Multi-axis Quantum Noise Spectroscopy in Temporally Correlated Environments
• Crosstalk Attacks and Defence in a Shared Quantum Computing Environment
• Dynamically Generated Decoherence-Free Subspaces and Subsystems on Superconducting Qubits
• Synergistic Dynamical Decoupling and Circuit Design for Enhanced Algorithm Performance on Near-Term Quantum Devices
• Demonstration of Algorithmic Quantum Speedup for an Abelian Hidden Subgroup Problem
• Fidelity-dissipation relations in quantum gates
• Probing Quantum Telecloning on Superconducting Quantum Processors
• Geometric correspondence of noisy quantum dynamics and universal robust quantum gates
• Simulating quantum circuits with arbitrary local noise using Pauli Propagation
• Scalable Parameter Design for Superconducting Quantum Circuits with Graph Neural Networks
• Simulating nonlinear optical processes on a superconducting quantum device
• Empirical learning of dynamical decoupling on quantum processors
• Distributed Partial Quantum Consensus of Qubit Networks with Connected Topologies
• Optimized Noise Suppression for Quantum Circuits
• Scalable protocol to mitigate $ZZ$ crosstalk in universal quantum gates
• Efficient Chromatic-Number-Based Multi-Qubit Decoherence and Crosstalk Suppression
• Randomized Benchmarking Protocol for Dynamic Circuits
• Real-time Sign-Problem-Suppressed Quantum Monte Carlo Algorithm For Noisy Quantum Circuit Simulations
• Virtual Z gates and symmetric gate compilation
• Mitigation of correlated readout errors without randomized measurements
• Robust implicit quantum control of interacting spin chains
• Sparse Non-Markovian Noise Modeling of Transmon-Based Multi-Qubit Operations
• Experimental Verification of Entangled States in the Adversarial Scenario
• Demonstration of High-Fidelity Entangled Logical Qubits using Transmons
• Binary Quantum Control Optimization with Uncertain Hamiltonians
• Engineering Precise and Robust Effective Hamiltonians
• The perfect entangler spectrum as a tool to analyze crosstalk
• Towards Robust Optimal Measurements Against Noise in Quantum Metrology
• Basic entanglement distillation with realistic noise
• Efficient learning and optimizing non-Gaussian correlated noise in digitally controlled qubit systems
• Non-Markovian Noise in Symmetry-Preserving Quantum Dynamics