Directional emission of a readout resonator for qubit measurement
arXiv:2403.01375 · doi:10.1103/PhysRevApplied.22.034035
Abstract
We propose and demonstrate transmission-based dispersive readout of a superconducting qubit using an all-pass resonator, which preferentially emits readout photons toward the output. This is in contrast to typical readout schemes, which intentionally mismatch the feedline at one end so that the readout signal preferentially decays toward the output. We show that this intentional mismatch creates scaling challenges, including larger spread of effective resonator linewidths due to non-ideal impedance environments and added infrastructure for impedance matching. A future architecture using multiplexed all-pass readout resonators would avoid the need for intentional mismatch and potentially improve the scaling prospects of quantum computers. As a proof-of-concept demonstration of "all-pass readout," we design and fabricate an all-pass readout resonator that demonstrates insertion loss below 1.17 dB at the readout frequency and a maximum insertion loss of 1.53 dB across its full bandwidth for the lowest three states of a transmon qubit. We demonstrate qubit readout with an average single-shot fidelity of 98.1% in 600 ns; to assess the effect of larger dispersive shift, we implement a shelving protocol and achieve a fidelity of 99.0% in 300 ns.
arXiv comment16 pages, 15 figures
References in corpus (39)
- Charge insensitive qubit design derived from the Cooper pair box
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Circuit Quantum Electrodynamics
- Introduction to Quantum Noise, Measurement and Amplification
- Suppressing quantum errors by scaling a surface code logical qubit
- Simple pulses for elimination of leakage in weakly nonlinear qubits
- AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
- Fast Scalable State Measurement with Superconducting Qubits
- Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
- A tunable coupling scheme for implementing high-fidelity two-qubit gates
- Exponential suppression of bit or phase flip errors with repetitive error correction
- Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
- Decoherence-free interaction between giant atoms in waveguide QED
- Waveguide Quantum Electrodynamics with Giant Superconducting Artificial Atoms
- Efficient and robust analysis of complex scattering data under noise in microwave resonators
- Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
- Rapid high-fidelity multiplexed readout of superconducting qubits
- 3D integrated superconducting qubits
- Noiseless nonreciprocity in a parametric active device
- Measurement-induced state transitions in a superconducting qubit: Beyond the rotating wave approximation
- The reconfigurable Josephson circulator/directional amplifier
- Resonantly phase-matched Josephson junction traveling wave parametric amplifier
- On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics
- The QICK (Quantum Instrumentation Control Kit): Readout and control for qubits and detectors
- Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
- On-chip superconducting microwave circulator from synthetic rotation
- Improving wafer-scale Josephson junction resistance variation in superconducting quantum coherent circuits
- Widely tunable on-chip microwave circulator for superconducting quantum circuits
- Quantum theory of a bandpass Purcell filter for qubit readout
- Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier
- Fabrication of stable and reproducible sub-micron tunnel junctions
- Microwave Package Design for Superconducting Quantum Processors
- General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
- Programmable directional emitter and receiver of itinerant microwave photons in a waveguide
- Transformed Dissipation in Superconducting Quantum Circuits
- Floquet-Mode Traveling-Wave Parametric Amplifiers
- Model-based Optimization of Superconducting Qubit Readout
- Design of an on-chip superconducting microwave circulator with octave bandwidth
- Experimentally verified, fast analytic and numerical design of superconducting resonators in flip-chip architectures