Thermal and Residual Excited-State Population in a 3D Transmon Qubit

Abstract

We present a systematic study of the first excited-state population in a 3D transmon qubit mounted in a dilution refrigerator with a variable temperature. Using a modified version of the protocol developed by Geerlings et al. [1], we observe the excited-state population to be consistent with a Maxwell-Boltzmann distribution, i.e., a qubit in thermal equilibrium with the refrigerator, over the temperature range 35-150 mK. Below 35 mK, the excited-state population saturates to 0.1%, near the resolution of our measurement. We verified this result using a flux qubit with ten-times stronger coupling to its readout resonator. We conclude that these qubits have effective temperature T_{eff} = 35 mK. Assuming T_{eff} is due solely to hot quasiparticles, the inferred qubit lifetime is 108 us and in plausible agreement with the measured 80 us.

References in corpus (38)

• The Physical Implementation of Quantum Computation
• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Opportunities for mesoscopics in thermometry and refrigeration: Physics and applications
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• State preservation by repetitive error detection in a superconducting quantum circuit
• Realization of Three-Qubit Quantum Error Correction with Superconducting Circuits
• Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
• Phase preserving amplification near the quantum limit with a Josephson Ring Modulator
• Observation of quantum jumps in a superconducting artificial atom
• A widely tunable parametric amplifier based on a SQUID array resonator
• Deterministic entanglement of superconducting qubits by parity measurement and feedback
• Computing prime factors with a Josephson phase qubit quantum processor
• Implementing a strand of a scalable fault-tolerant quantum computing fabric
• Detecting bit-flip errors in a logical qubit using stabilizer measurements
• Dispersive magnetometry with a quantum limited SQUID parametric amplifier
• Tracking Photon Jumps with Repeated Quantum Non-Demolition Parity Measurements
• Loss and decoherence due to stray infrared light in superconducting quantum circuits
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Protecting superconducting qubits from external sources of loss and heat
• Resonantly phase-matched Josephson junction traveling wave parametric amplifier
• Heralded state preparation in a superconducting qubit
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Microwave-Induced Cooling of a Superconducting Qubit
• Josephson directional amplifier for quantum measurement of superconducting circuits
• Design and characterization of a lumped element single-ended superconducting microwave parametric amplifier with on-chip flux bias line
• Reversing quantum trajectories with analog feedback
• Single-shot readout of a superconducting flux qubit with a flux-driven Josephson parametric amplifier
• Excitation of superconducting qubits from hot non-equilibrium quasiparticles
• Entanglement genesis by ancilla-based parity measurement in 2D circuit QED
• Simulating weak localization using superconducting quantum circuits
• Impedance-matched low-pass stripline filters
• Millikelvin thermal and electrical performance of lossy transmission line filters
• Time-Reversal Symmetry and Universal Conductance Fluctuations in a Driven Two-Level System
• Micro-fabricated electromagnetic filters for millikelvin experiments
• The pumpistor: a linearized model of a flux-pumped SQUID for use as a negative-resistance parametric amplifier

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