Reducing Spontaneous Emission in Circuit Quantum Electrodynamics by a Combined Readout/Filter Technique

Abstract

Physical implementations of qubits can be extremely sensitive to environmental coupling, which can result in decoherence. While efforts are made for protection, coupling to the environment is necessary to measure and manipulate the state of the qubit. As such, the goal of having long qubit energy relaxation times is in competition with that of achieving high-fidelity qubit control and measurement. Here we propose a method that integrates filtering techniques for preserving superconducting qubit lifetimes together with the dispersive coupling of the qubit to a microwave resonator for control and measurement. The result is a compact circuit that protects qubits from spontaneous loss to the environment, while also retaining the ability to perform fast, high-fidelity readout. Importantly, we show the device operates in a regime that is attainable with current experimental parameters and provide a specific example for superconducting qubits in circuit quantum electrodynamics.

9 pages, 6 figures, 1 table

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Cited by in corpus (20)

• Coherent conversion between microwave and optical photons -- an overview of physical implementations
• Cavity-based architecture to preserve quantum coherence and entanglement
• Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
• Broadband Filters for Abatement of Spontaneous Emission in Circuit Quantum Electrodynamics
• Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
• Robustness of error-suppressing entangling gates in cavity-coupled transmon qubits
• Photon-noise-tolerant dispersive readout of a superconducting qubit using a nonlinear Purcell filter
• Atomic Bell measurement via two-photon interactions
• Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
• Enhanced qubit readout using locally-generated squeezing and inbuilt Purcell-decay suppression
• High-Coherence Kerr-cat qubit in 2D architecture
• Closing a quantum feedback loop inside a cryostat: Autonomous state preparation and long-time memory of a superconducting qubit
• Characterizing a Four-Qubit Planar Lattice for Arbitrary Error Detection
• A Review of Design Concerns in Superconducting Quantum Circuits
• Equation of motion approach to black-box quantization: taming the multi-mode Jaynes-Cummings model
• Interferometric Purcell suppression of spontaneous emission in a superconducting qubit
• Optimizing resetting of superconducting qubits
• Entanglement Dynamics of Two V-type Atoms with Dipole-Dipole Interaction in Dissipative Cavity
• Multimode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection
• Scalable quantum eraser for superconducting integrated circuits