Time-domain characterization and correction of on-chip distortion of control pulses in a quantum processor

Abstract

We introduce Cryoscope, a method for sampling on-chip baseband pulses used to dynamically control qubit frequency in a quantum processor. We specifically use Cryoscope to measure the step response of the dedicated flux control lines of two-junction transmon qubits in circuit QED processors with the temporal resolution of the room-temperature arbitrary waveform generator producing the control pulses. As a first application, we iteratively improve this step response using optimized real-time digital filters to counter the linear-dynamical distortion in the control line, as needed for high-fidelity, repeatable one- and two-qubit gates based on dynamical control of qubit frequency.

References in corpus (10)

• Charge insensitive qubit design derived from the Cooper pair box
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• A fast, low-leakage, high-fidelity two-qubit gate for a programmable superconducting quantum computer
• Electrically controlling single spin qubits in a continuous microwave field
• Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence
• Error Mitigation by Symmetry Verification on a Variational Quantum Eigensolver
• Evolution of Nanowire Transmons and Their Quantum Coherence in Magnetic Field
• In situ characterization of qubit control lines: a qubit as a vector network analyzer

Cited by in corpus (62)

• Circuit Quantum Electrodynamics
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Leakage reduction in fast superconducting qubit gates via optimal control
• Fluxonium: an alternative qubit platform for high-fidelity operations
• Model-Free Quantum Control with Reinforcement Learning
• Experimental Deep Reinforcement Learning for Error-Robust Gateset Design on a Superconducting Quantum Computer
• Tutorial: Gate-based superconducting quantum computing
• High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor
• Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
• A scalable superconducting quantum simulator with long-range connectivity based on a photonic bandgap metamaterial
• Coherent control of quantum topological states of light in Fock-state lattices
• A volumetric framework for quantum computer benchmarks
• Rapid and Unconditional Parametric Reset Protocol for Tunable Superconducting Qubits
• Integrated tool-set for Control, Calibration and Characterization of quantum devices applied to superconducting qubits
• Long-distance transmon coupler with CZ gate fidelity above $99.8\%$
• Microwave Package Design for Superconducting Quantum Processors
• Variational preparation of finite-temperature states on a quantum computer
• Reducing leakage of single-qubit gates for superconducting quantum processors using analytical control pulse envelopes
• Fast multi-qubit gates through simultaneous two-qubit gates
• Optimizing quantum gates towards the scale of logical qubits
• Realization of Superadiabatic Two-qubit Gates Using Parametric Modulation in Superconducting Circuits
• Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
• Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
• Phonon engineering of atomic-scale defects in superconducting quantum circuits
• Strong tunable coupling between two distant superconducting spin qubits
• Deterministic remote entanglement using a chiral quantum interconnect
• Microwave calibration of qubit drive line components at millikelvin temperatures
• Equivalence Checking of Sequential Quantum Circuits
• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Optimizing quantum control pulses with complex constraints and few variables through Tensorflow
• Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
• Realization of fast all-microwave CZ gates with a tunable coupler
• Driving a low critical current Josephson junction array with a mode-locked laser
• High-precision pulse calibration of tunable couplers for high-fidelity two-qubit gates in superconducting quantum processors
• Quantum control of continuous systems via nonharmonic potential modulation
• Hardware implementation of quantum stabilizers in superconducting circuits
• Baseband control of superconducting qubits with shared microwave drives
• Probing Site-Resolved Current in Strongly Interacting Superconducting Circuit Lattices
• Coupling high-overtone bulk acoustic wave resonators via superconducting qubits
• Reduce&chop: Shallow circuits for deeper problems
• Realizing Lattice Surgery on Two Distance-Three Repetition Codes with Superconducting Qubits
• Nonlinear Signal Distortion Corrections Through Quantum Sensing
• Realizing a Continuous Set of Two-Qubit Gates Parameterized by an Idle Time
• Compact optical waveform generator with digital feedback
• Realization of Constant-Depth Fan-Out with Real-Time Feedforward on a Superconducting Quantum Processor
• Dynamical excitation control and multimode emission of an atom-photon bound state
• Sub-Harmonic Control of a Fluxonium Qubit via a Purcell-Protected Flux Line
• Capacitively Shunted Double-Transmon Coupler Realizing Bias-Free Idling and High-Fidelity CZ Gate
• Identification of Time-varying in situ Signals in Quantum Circuits
• Operating two exchange-only qubits in parallel
• Characterization and Optimization of Tunable Couplers via Adiabatic Control in Superconducting Circuits
• Above 99.9% Fidelity Single-Qubit Gates, Two-Qubit Gates, and Readout in a Single Superconducting Quantum Device
• Parametric phase modulation in superconducting circuits
• Correcting on-chip distortion of control pulses with silicon spin qubits
• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
• Application of Optimal Control to Time-Resolution Protocol for Quantum Sensing
• The superconducting clock-circuit: Improving the coherence of Josephson radiation beyond the thermodynamic uncertainty relation
• Non-demolition fluorescence readout and high-fidelity unconditional reset of a fluxonium qubit via dissipation engineering
• Measuring and correcting nanosecond pulse distortions in quantum-dot spin qubits
• Topology-Aware Block Coordinate Descent for Qubit Frequency Allocation of Superconducting Quantum Processors
• A strong-driving toolkit for topological Floquet energy pumps with superconducting circuits
• Exploring the Fidelity of Flux Qubit Measurement in Different Bases via the Quantum Flux Parametron