Probing context-dependent errors in quantum processors

Abstract

Gates in error-prone quantum information processors are often modeled using sets of one- and two-qubit process matrices, the standard model of quantum errors. However, the results of quantum circuits on real processors often depend on additional external "context" variables. Such contexts may include the state of a spectator qubit, the time of data collection, or the temperature of control electronics. In this article we demonstrate a suite of simple, widely applicable, and statistically rigorous methods for detecting context dependence in quantum circuit experiments. They can be used on any data that comprise two or more "pools" of measurement results obtained by repeating the same set of quantum circuits in different contexts. These tools may be integrated seamlessly into standard quantum device characterization techniques, like randomized benchmarking or tomography. We experimentally demonstrate these methods by detecting and quantifying crosstalk and drift on the publicly accessible 16-qubit ibmqx3.

arXiv comment11 pages, 3 figures, code and data available in source files

References in corpus (34)

• Randomized Benchmarking of Quantum Gates
• Robust randomized benchmarking of quantum processes
• Scalable Noise Estimation with Random Unitary Operators
• Efficient measurement of quantum gate error by interleaved randomized benchmarking
• Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography
• Characterization of addressability by simultaneous randomized benchmarking
• Self-Consistent Quantum Process Tomography
• Symmetrised Characterisation of Noisy Quantum Processes
• Estimating the Coherence of Noise
• Quantification and Characterization of Leakage Errors
• Three Qubit Randomized Benchmarking
• Characterizing errors on qubit operations via iterative randomized benchmarking
• Machine-learning-assisted correction of correlated qubit errors in a topological code
• Robust Calibration of a Universal Single-Qubit Gate-Set via Robust Phase Estimation
• Direct randomized benchmarking for multi-qubit devices
• Bounding quantum gate error rate based on reported average fidelity
• Characterizing Universal Gate Sets via Dihedral Benchmarking
• Robust, self-consistent, closed-form tomography of quantum logic gates on a trapped ion qubit
• A trapped-ion based quantum byte with $10^{-5}$ next-neighbour cross-talk
• Introduction to Quantum Gate Set Tomography
• Non-exponential Fidelity Decay in Randomized Benchmarking with Low-Frequency Noise
• Modeling coherent errors in quantum error correction
• Optimization of a solid-state electron spin qubit using Gate Set Tomography
• Real Randomized Benchmarking
• Robust Characterization of Loss Rates
• When quantum tomography goes wrong: drift of quantum sources and other errors
• Measurement crosstalk between two phase qubits coupled by a coplanar waveguide
• Randomized Benchmarking with Restricted Gate Sets
• Experimental demonstration of cheap and accurate phase estimation
• Approximate Randomized Benchmarking for Finite Groups
• Optimized pulses for the control of uncertain qubits
• Hybrid benchmarking of arbitrary quantum gates
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• In-situ Adaptive Encoding for Asymmetric Quantum Error Correcting Codes

Cited by in corpus (39)

• When Entanglement meets Classical Communications: Quantum Teleportation for the Quantum Internet (Invited Paper)
• Software Mitigation of Crosstalk on Noisy Intermediate-Scale Quantum Computers
• Gate Set Tomography
• Detecting crosstalk errors in quantum information processors
• Quantum gate teleportation between separated qubits in a trapped-ion processor
• A general framework for randomized benchmarking
• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• Detecting and tracking drift in quantum information processors
• Non-Markovian Quantum Process Tomography
• A volumetric framework for quantum computer benchmarks
• Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
• Probing quantum processor performance with pyGSTi
• Methods for Measuring Magnetic Flux Crosstalk Between Tunable Transmons
• Experimental Characterization of Crosstalk Errors with Simultaneous Gate Set Tomography
• Simultaneous execution of quantum circuits on current and near-future NISQ systems
• Evaluating energy differences on a quantum computer with robust phase estimation
• Modeling and mitigation of cross-talk effects in readout noise with applications to the Quantum Approximate Optimization Algorithm
• Simulating and mitigating crosstalk
• Modeling Noisy Quantum Circuits Using Experimental Characterization
• Randomized benchmarking for non-Markovian noise
• Scalable Benchmarks for Gate-Based Quantum Computers
• Demonstrating scalable randomized benchmarking of universal gate sets
• Control and mitigation of microwave crosstalk effect with superconducting qubits
• Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
• Filtering crosstalk from bath non-Markovianity via spacetime classical shadows
• Towards Quantum Computing with Molecular Electronics
• Operational, gauge-free quantum tomography
• Scalable evaluation of quantum-circuit error loss using Clifford sampling
• Quantum circuit debugging and sensitivity analysis via local inversions
• Randomized linear gate set tomography
• Self-consistent state and measurement tomography with fewer measurements
• Qubit assignment using time reversal
• Context Aware Fidelity Estimation
• Wildcard error: Quantifying unmodeled errors in quantum processors
• Near-Minimal Gate Set Tomography Experiment Designs
• Unifying non-Markovian characterisation with an efficient and self-consistent framework
• Invariance of success probability in Grover's quantum search under local noise with memory
• Robustly decorrelating errors with mixed quantum gates
• Diagnosing crosstalk in large-scale QPUs using zero-entropy classical shadows