Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits
arXiv:2309.07060 · doi:10.1103/PhysRevLett.134.120601
Abstract
Quantum computers will require quantum error correction to reach the low error rates necessary for solving problems that surpass the capabilities of conventional computers. One of the dominant errors limiting the performance of quantum error correction codes across multiple technology platforms is leakage out of the computational subspace arising from the multi-level structure of qubit implementations. Here, we present a resource-efficient universal leakage reduction unit for superconducting qubits using parametric flux modulation. This operation removes leakage down to our measurement accuracy of in approximately with a low error of on the computational subspace, thereby reaching durations and fidelities comparable to those of single-qubit gates. We demonstrate that using the leakage reduction unit in repeated weight-two stabilizer measurements reduces the total number of detected errors in a scalable fashion to close to what can be achieved using leakage-rejection methods which do not scale. Our approach does neither require additional control electronics nor on-chip components and is applicable to both auxiliary and data qubits. These benefits make our method particularly attractive for mitigating leakage in large-scale quantum error correction circuits, a crucial requirement for the practical implementation of fault-tolerant quantum computation.
References in corpus (49)
- Quantum Computing in the NISQ era and beyond
- Charge insensitive qubit design derived from the Cooper pair box
- Surface codes: Towards practical large-scale quantum computation
- Circuit Quantum Electrodynamics
- Quantum Error Correction for Quantum Memories
- Strong quantum computational advantage using a superconducting quantum processor
- Suppressing quantum errors by scaling a surface code logical qubit
- State preservation by repetitive error detection in a superconducting quantum circuit
- Simple pulses for elimination of leakage in weakly nonlinear qubits
- Digitized adiabatic quantum computing with a superconducting circuit
- Efficient measurement of quantum gate error by interleaved randomized benchmarking
- Exponential suppression of bit or phase flip errors with repetitive error correction
- Repeated Quantum Error Detection in a Surface Code
- Resilient Quantum Computation: Error Models and Thresholds
- Fluctuations of Energy-Relaxation Times in Superconducting Qubits
- Rapid high-fidelity multiplexed readout of superconducting qubits
- Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
- Fast and Unconditional All-Microwave Reset of a Superconducting Qubit
- Measurement-induced state transitions in a superconducting qubit: Beyond the rotating wave approximation
- Parametrically Activated Entangling Gates Using Transmon Qubits
- A fast, low-leakage, high-fidelity two-qubit gate for a programmable superconducting quantum computer
- Leakage reduction in fast superconducting qubit gates via optimal control
- First-order sideband transitions with flux-driven asymmetric transmon qubits
- Electric field spectroscopy of material defects in transmon qubits
- Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
- Logical-qubit operations in an error-detecting surface code
- Removing leakage-induced correlated errors in superconducting quantum error correction
- On-Chip Spin-Orbit Controlled Excitation of Quantum Emitters Coupled to Hybrid Plasmonic Nanocircuits
- High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor
- First-order sidebands in circuit QED using qubit frequency modulation
- Matching and maximum likelihood decoding of a multi-round subsystem quantum error correction experiment
- Coping with qubit leakage in topological codes
- Dynamics of Transmon Ionization
- Overcoming leakage in scalable quantum error correction
- Quantifying error and leakage in an encoded Si/SiGe triple-dot qubit
- Measurement-Induced State Transitions in a Superconducting Qubit: Within the Rotating Wave Approximation
- Pulsed reset protocol for fixed-frequency superconducting qubits
- Protecting quantum entanglement from leakage and qubit errors via repetitive parity measurements
- Deterministic correction of qubit loss
- Leakage detection for a transmon-based surface code
- Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
- Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
- All-microwave leakage reduction units for quantum error correction with superconducting transmon qubits
- A hardware-efficient leakage-reduction scheme for quantum error correction with superconducting transmon qubits
- A leakage-resilient approach to fault-tolerant quantum computing with superconducting elements
- Eliminating Leakage Errors in Hyperfine Qubits
- Adaptive weight estimator for quantum error correction
- Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
- Maximizing device-independent randomness from a Bell experiment by optimizing the measurement settings
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- Balanced cross-Kerr coupling for superconducting qubit readout
- Quantum error detection in qubit-resonator star architecture
- Resource-Efficient Cross-Platform Verification with Modular Superconducting Devices
- Multimode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection
- Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters
- Optimal number of stabilizer measurement rounds in an idling surface code patch
- Leakage Mobility in Superconducting Qubits as a Leakage Reduction Unit
- Logical operations with a dynamical qubit in Floquet-Bacon-Shor code
- Feedforward suppression of readout-induced faults in quantum error correction