Protocol for temperature sensing using a three-level transmon circuit

Abstract

We present a method for in situ temperature measurement of superconducting quantum circuits, by using the first three levels of a transmon device to which we apply a sequence of $\pi$ gates. Our approach employs projective dispersive readout and utilizes the basic properties of the density matrix associated with thermal states. This method works with an averaging readout scheme and does not require a single-shot readout setup. We validate this protocol by performing thermometry in the range of 50 mK - 200 mK, corresponding to a range of residual populations $1\%-20\%$ for the first excited state and $0.02\%-3\%$ for the second excited state.

10 pages, 9 figures, 1 table

References in corpus (15)

• Charge insensitive qubit design derived from the Cooper pair box
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Observation of quantum jumps in a superconducting artificial atom
• Decoherence benchmarking of superconducting qubits
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Initialization by measurement of a two-qubit superconducting circuit
• Control and Tomography of a Three Level Superconducting Artificial Atom
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Microwave-Induced Cooling of a Superconducting Qubit
• Otto refrigerator based on a superconducting qubit: classical and quantum performance
• Excitation of superconducting qubits from hot non-equilibrium quasiparticles
• Perspective: Reproducible Coherence Characterization of Superconducting Quantum Devices