Error-Mitigated Quantum Random Access Memory

Abstract

As an alternative to quantum error correction, quantum error mitigation methods, including Zero-Noise Extrapolation (ZNE), have been proposed to alleviate run-time errors in current noisy quantum devices. In this work, we propose a modified version of ZNE that provides for a significant performance enhancement on current noisy devices. Our modified ZNE method extrapolates to zero-noise data by evaluating groups of noisy data obtained from noise-scaled circuits and selecting extrapolation functions for each group with the assistance of estimated noisy simulation results. To quantify enhancement in a real-world quantum application, we embed our modified ZNE in Quantum Random Access Memory (QRAM) - a memory system important for future quantum networks and computers. Our new ZNE-enhanced QRAM designs are experimentally implemented on a 27-qubit noisy superconducting quantum device, the results of which demonstrate QRAM fidelity can be improved significantly relative to traditional ZNE usage. Our results demonstrate the critical role the extrapolation function plays in ZNE - judicious choice of that function on a per-measurement basis can make the difference between a quantum application being functional or non-functional.

References in corpus (15)

• Quantum Computing in the NISQ era and beyond
• Error mitigation for short-depth quantum circuits
• Quantum random access memory
• Extending the computational reach of a noisy superconducting quantum processor
• Quantum Error Mitigation
• Digital zero noise extrapolation for quantum error mitigation
• Resource Efficient Zero Noise Extrapolation with Identity Insertions
• On the robustness of bucket brigade quantum RAM
• Error-Mitigated Quantum Gates Exceeding Physical Fidelities in a Trapped-Ion System
• Fault tolerant resource estimation of quantum random-access memories
• Unified approach to data-driven quantum error mitigation
• Unifying and benchmarking state-of-the-art quantum error mitigation techniques
• Parallelising the Queries in Bucket Brigade Quantum RAM
• Adaptive quantum error mitigation using pulse-based inverse evolutions
• Synergetic quantum error mitigation by randomized compiling and zero-noise extrapolation for the variational quantum eigensolver