Flip-chip-based fast inductive parity readout of a planar superconducting island

Abstract

Properties of superconducting devices depend sensitively on the parity (even or odd) of the quasiparticles they contain. Encoding quantum information in the parity degree of freedom is central in several emerging solid-state qubit architectures. Yet, accurate, non-destructive, and time-resolved parity measurement is a challenging and long-standing issue. Here we report on control and real-time parity measurement in a superconducting island embedded in a superconducting loop and realized in a hybrid two-dimensional heterostructure using a microwave resonator. Device and readout resonator are located on separate chips, connected via flip-chip bonding, and couple inductively through vacuum. The superconducting resonator detects the parity-dependent circuit inductance, allowing for fast and non-destructive parity readout. We resolved even and odd parity states with signal-to-noise ratio SNR $\approx 3$ with an integration time of $20\mu$s and detection fidelity exceeding 98%. Real-time parity measurement showed state lifetime extending into millisecond range. Our approach will lead to better understanding of coherence-limiting mechanisms in superconducting quantum hardware and provide novel readout schemes for hybrid qubits.

References in corpus (31)

• Circuit Quantum Electrodynamics
• Supercurrent reversal in quantum dots
• Universal control of a six-qubit quantum processor in silicon
• Majorana box qubits
• Correlated Charge Noise and Relaxation Errors in Superconducting Qubits
• Parity qubits and poor man's Majorana bound states in double quantum dots
• Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits
• Coherent manipulation of an Andreev spin qubit
• Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
• Universal logic with encoded spin qubits in silicon
• Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit
• Engineering superconducting qubits to reduce quasiparticles and charge noise
• Mitigation of Cosmic Ray Effect on Microwave Kinetic Inductance Detector Arrays
• Microsecond resolution of quasiparticle tunneling in the single-Cooper-pair-transistor
• Time-domain measurements of quasiparticle tunneling rates in a single-Cooper-pair transistor
• Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
• Minimal Kitaev-transmon qubit based on double quantum dots
• Rapid detection of coherent tunneling in an InAs nanowire quantum dot through dispersive gate sensing
• Josephson inductance as a probe for highly ballistic semiconductor-superconductor weak links
• Phase-dependent microwave response of a graphene Josephson junction
• Rapid microwave-only characterization and readout of quantum dots using multiplexed gigahertz-frequency resonators
• Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
• Microwave spectroscopy of Andreev states in InAs nanowire-based hybrid junctions using a flip-chip layout
• Quantum circuits with multiterminal Josephson-Andreev junctions
• Detecting Majorana modes by readout of poisoning-induced parity flips
• Supercurrent parity-meter in a nanowire Cooper-pair transistor
• Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
• Microwave Sensing of Andreev Bound States in a Gate-Defined Superconducting Quantum Point Contact
• Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island
• Extracting entangled qubits from Majorana fermions in quantum dot chains through the measurement of parity
• Parity switching in a full-shell superconductor-semiconductor nanowire qubit

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