Cavity Attenuators for Superconducting Qubits
arXiv:1807.04849 · doi:10.1103/PhysRevApplied.11.014031
Abstract
Dephasing induced by residual thermal photons in the readout resonator is a leading factor limiting the coherence times of qubits in the circuit QED architecture. This residual thermal population, of the order of --, is suspected to arise from noise impinging on the resonator from its input and output ports. To address this problem, we designed and tested a new type of band-pass microwave attenuator that consists of a dissipative cavity well thermalized to the mixing chamber stage of a dilution refrigerator. By adding such a cavity attenuator inline with a 3D superconducting cavity housing a transmon qubit, we have reproducibly measured increased qubit coherence times. At base temperature, through Hahn echo experiment, we measured for two qubits over multiple cooldowns. Through noise-induced dephasing measurement, we obtained an upper bound on the residual photon population in the fundamental mode of the readout cavity, which to our knowledge is the lowest value reported so far. These results validate an effective method for protecting qubits against photon noise, which can be developed into a standard technology for quantum circuit experiments.
arXiv comment8 pages, 6 figures
References in corpus (29)
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Charge insensitive qubit design derived from the Cooper pair box
- Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
- Manipulating the Quantum State of an Electrical Circuit
- Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
- Fluxonium: single Cooper pair circuit free of charge offsets
- The Flux Qubit Revisited to Enhance Coherence and Reproducibility
- Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
- Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
- Controlling the spontaneous emission of a superconducting transmon qubit
- Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
- Dephasing of a superconducting qubit induced by photon noise
- Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
- Low-decoherence flux qubit
- Millisecond charge-parity fluctuations and induced decoherence in a superconducting qubit
- Demonstrating a Driven Reset Protocol of a Superconducting Qubit
- 3-Wave Mixing Josephson Dipole Element
- Robust concurrent remote entanglement between two superconducting qubits
- Optimizing the nonlinearity and dissipation of a SNAIL Parametric Amplifier for dynamic range
- Photon Shot Noise Dephasing in the Strong-Dispersive Limit of Circuit QED
- Using a qubit to measure photon number statistics of a driven, thermal oscillator
- High coherence hybrid superconducting qubit
- Distinguishing coherent and thermal photon noise in a circuit QED system
- Microwave attenuators for use with quantum devices below 100 mK
- Novel E-beam lithography technique for in-situ junction fabrication: the controlled undercut
- Bulk and surface loss in superconducting transmon qubits
- Photon Statistics of Propagating Thermal Microwaves
- Observation of Autler-Townes effect in a dispersively dressed Jaynes-Cummings system
- Wireless Josephson Amplifier
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- Circuit Quantum Electrodynamics
- A Quantum Engineer's Guide to Superconducting Qubits
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- Materials loss measurements using superconducting microwave resonators
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- Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons
- Seamless high-Q microwave cavities for multimode circuit QED
- Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums
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- Efficient qubit measurement with a nonreciprocal microwave amplifier
- Photon-noise-tolerant dispersive readout of a superconducting qubit using a nonlinear Purcell filter
- Stabilizing two-qubit entanglement by mimicking a squeezed environment
- Analytic Design of Accelerated Adiabatic Gates in Realistic Qubits: General Theory and Applications to Superconducting Circuits
- Bare-Excitation Ground State of a Spinless-Fermion -- Boson Model and -State Engineering in an Array of Superconducting Qubits and Resonators
- Breaking the trade-off between fast control and long lifetime of a superconducting qubit
- Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
- Efficient quantum error correction of dephasing induced by a common fluctuator
- Fast and Robust Geometric Two-Qubit Gates for Superconducting Qubits and beyond
- Strong parametric dispersive shifts in a statically decoupled multi-qubit cavity QED system
- Free-standing silicon shadow masks for transmon qubit fabrication
- High-fidelity qubit readout using interferometric directional Josephson devices
- Native three-body interaction in superconducting circuits
- Spectral characterization of non-Gaussian quantum noise: Keldysh approach and application to photon shot noise
- Integrating superfluids with superconducting qubit systems
- Lattice gauge theory and dynamical quantum phase transitions using noisy intermediate scale quantum devices
- Manufacturing high-Q superconducting α-tantalum resonators on silicon wafers
- On-demand driven dissipation for cavity reset and cooling
- Weakly Flux-Tunable Superconducting Qubit
- Quantum interference device for controlled two-qubit operations
- A controllable two-qubit swapping gate using superconducting circuits
- Quantum outage probability for time-varying quantum channels
- Hot electron heatsinks for microwave attenuators below 100 mK
- Flux-pulse-assisted Readout of a Fluxonium Qubit
- An engineering guide to superconducting quantum circuit shielding
- Optical Direct Write of Dolan--Niemeyer-Bridge Junctions for Transmon Qubits
- Noise-specific beats in the higher-level Ramsey curves of a transmon qubit
- Decoherence and Quantum Error Correction for Quantum Computing and Communications
- Recovering Quantum Coherence of a Cavity Qubit Coupled to a Noisy Ancilla through Real-Time Feedback
- Engineering a multi-level bath for transmons with three-wave mixing and parametric drives
- A practical guide for building superconducting quantum devices
- Non-Gaussian macroscopic entanglement of motion in a hybrid electromechanical device
- Dynamics of a dispersively coupled transmon qubit in the presence of a noise source embedded in the control line
- Mitigating state transition errors during readout with a synchronized flux pulse
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- Review of Superconducting Qubit Devices and Their Large-Scale Integration
- Autonomous Quantum Error Correction in a Four-Photon Kerr Parametric Oscillator
- Quantum feedback for measurement and control