Readout Rebalancing for Near Term Quantum Computers

Abstract

Readout errors are a significant source of noise for near term intermediate scale quantum computers. Mismeasuring a qubit as a 1 when it should be 0 occurs much less often than mismeasuring a qubit as a 0 when it should have been 1. We make the simple observation that one can improve the readout fidelity of quantum computers by applying targeted X gates prior to performing a measurement. These X gates are placed so that the expected number of qubits in the 1 state is minimized. Classical post processing can undo the effect of the X gates so that the expectation value of any observable is unchanged. We show that the statistical uncertainty following readout error corrections is smaller when using readout rebalancing. The statistical advantage is circuit- and computer-dependent, and is demonstrated for the $W$ state, a Grover search, and for a Gaussian state. The benefit in statistical precision is most pronounced (and nearly a factor of two in some cases) when states with many qubits in the excited state have high probability.

8 pages, 4 figures, 1 table

References in corpus (44)

• Quantum Computing in the NISQ era and beyond
• Supervised learning with quantum enhanced feature spaces
• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Error mitigation for short-depth quantum circuits
• Quantum Error Correction for Quantum Memories
• State preservation by repetitive error detection in a superconducting quantum circuit
• Extending the computational reach of a noisy superconducting quantum processor
• Demonstration of a small programmable quantum computer with atomic qubits
• Quantum Error Correction for Beginners
• Efficient variational quantum simulator incorporating active error minimisation
• Practical Quantum Error Mitigation for Near-Future Applications
• Quantum Algorithms for Quantum Field Theories
• 10-qubit entanglement and parallel logic operations with a superconducting circuit
• Generation of Three-Qubit Entangled States using Superconducting Phase Qubits
• Cloud Quantum Computing of an Atomic Nucleus
• Quantum Process Tomography of a Universal Entangling Gate Implemented with Josephson Phase Qubits
• Experimental demonstration of fault-tolerant state preparation with superconducting qubits
• Mitigation of readout noise in near-term quantum devices by classical post-processing based on detector tomography
• Genuine 12-qubit entanglement on a superconducting quantum processor
• Fault-tolerant quantum error detection
• Digitization of Scalar Fields for Quantum Computing
• Resource Efficient Zero Noise Extrapolation with Identity Insertions
• An Introduction to Quantum Error Correction and Fault-Tolerant Quantum Computation
• Verifying Multipartite Entangled GHZ States via Multiple Quantum Coherences
• Machine learning for discriminating quantum measurement trajectories and improving readout
• Detector Tomography on IBM 5-qubit Quantum Computers and Mitigation of Imperfect Measurement
• Fault-Tolerant Logical Gates in the IBM Quantum Experience
• Electron-Phonon Systems on a Universal Quantum Computer
• Characterization of a two-transmon processor with individual single-shot qubit readout
• A quantum-classical cloud platform optimized for variational hybrid algorithms
• BQP-completeness of Scattering in Scalar Quantum Field Theory
• Digital quantum computation of fermion-boson interacting systems
• Efficient correction of multiqubit measurement errors
• Demonstration of Adiabatic Variational Quantum Computing with a Superconducting Quantum Coprocessor
• Quantum Algorithms for Fermionic Quantum Field Theories
• A repetition code of 15 qubits
• Rigorous measurement error correction
• Error detection on quantum computers improves accuracy of chemical calculations
• Protecting quantum memories using coherent parity check codes
• Testing quantum fault tolerance on small systems
• Quantum simulations of one dimensional quantum systems
• Improving the efficiency of joint remote state preparation in noisy environment with weak measurement
• Universal bound on the cardinality of local hidden variables in networks
• Is error detection helpful on IBM 5Q chips ?

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