Saturable Purcell filter for circuit quantum electrodynamics

Abstract

We consider a typical circuit QED setup where an artificial atom encodes a qubit and is dispersively coupled to a measurement resonator that in turn is coupled to a transmission line. We show theoretically that by placing another artificial atom in this transmission line to act as a filter, the Purcell decay of the qubit into the transmission line is suppressed. When strong control fields are applied in the transmission line, the filter is saturated and effectively switched off. Such a Purcell filtering capability permits both the control and measurement of the qubit using the single transmission line, while maintaining the long coherence time of the qubit in the absence of the control pulses. We show that high fidelity Pauli ${\sigma }_x$ gates on the qubit can be realized using simple pulse shapes. For devices that already use one transmission line both for control and measurement of the qubit, our work provides a way to completely filter out the qubit frequency without removing the possibility of controlling the system. Further, combining the proposed filter with frequency multiplexing potentially enables both control and measurement of several qubits using a single Purcell-filtered transmission line. This will enhance the scalability of superconducting quantum processors by decreasing the number of the required transmission lines.

arXiv comment21 pages, 9 figures

References in corpus (36)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Introduction to Quantum Noise, Measurement and Amplification
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• A simple formula for the average gate fidelity of a quantum dynamical operation
• New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
• Controlling the spontaneous emission of a superconducting transmon qubit
• Entanglement-based single-shot detection of a single magnon with a superconducting qubit
• Fast Scalable State Measurement with Superconducting Qubits
• Optimal control technique for Many Body Quantum Systems dynamics
• Transmon qubit with relaxation time exceeding 0.5 milliseconds
• Realization of an Error-Correcting Surface Code with Superconducting Qubits
• Decoherence benchmarking of superconducting qubits
• Quantum walks on a programmable two-dimensional 62-qubit superconducting processor
• Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
• 3D integrated superconducting qubits
• Review of Inverse Laplace Transform Algorithms for Laplace-Space Numerical Approaches
• Strong environmental coupling in a Josephson parametric amplifier
• Leakage reduction in fast superconducting qubit gates via optimal control
• Fidelity of Single Qubit Maps
• Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement
• 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
• Optimal control methods for fast time-varying Hamiltonians
• Frequency Division Multiplexing Readout and Simultaneous Manipulation of an Array of Flux Qubits
• Gradient-based optimal control of open quantum systems using quantum trajectories and automatic differentiation
• Multiplexed dispersive readout of superconducting phase qubits
• Calibrated decoders for experimental quantum error correction
• Convergence of the multimode quantum Rabi model of circuit quantum electrodynamics
• Broadband Filters for Abatement of Spontaneous Emission in Circuit Quantum Electrodynamics
• Cutoff-free Circuit Quantum Electrodynamics
• A recipe for Hamiltonian of system-environment coupling applicable to ultrastrong light-matter interaction regime
• Origin and Implications of $A^2$-like Contribution in the Quantization of Circuit-QED Systems
• Cooperative Fluorescence from a Strongly Driven Dilute Cloud of Atoms
• Breaking the trade-off between fast control and long lifetime of a superconducting qubit
• High-Fidelity Control of Superconducting Qubits Using Direct Microwave Synthesis in Higher Nyquist Zones
• Protection of a qubit with a subradiance effect: Josephson quantum filter

Cited by in corpus (2)

• Photon-noise-tolerant dispersive readout of a superconducting qubit using a nonlinear Purcell filter
• Spin amplification in realistic systems