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Measurement of the electronic thermal conductance channels and heat capacity of graphene at low temperature
K. C. Fong, Emma Wollman, Harish Ravi +5
The ability to transport energy is a fundamental property of the two-dimensional Dirac fermions in graphene. Electronic thermal transport in this system is relatively unexplored an…
The Quantum Capacitance Detector: A concept for a pair-breaking radiation detector based on the single Cooper-pair box
M. D. Shaw, J. Bueno, P. Day +2
We present a proposed design for a pair-breaking photodetector for far-infrared and sub-millimeter radiation. Antenna-coupled radiation generates quasiparticles in a superconductin…
Characterization of an entangled system of two superconducting qubits using a multiplexed capacitance readout
M. D. Shaw, J. F. Schneiderman, J. Bueno +3
We characterize a pair of Cooper-pair boxes coupled with a fixed capacitor using spectroscopy and measurements of the ground-state quantum capacitance. We use the extracted paramet…
Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
M. D. Shaw, R. Lutchyn, P. Delsing +1
We directly observe low-temperature non-equilibrium quasiparticle tunneling in a pair of charge qubits based on the single Cooper-pair box. We measure even- and odd-state dwell tim…
Quasiparticle Poisoning and Quantum Coherence in a Differential Charge Qubit
J. F. Schneiderman, M. D. Shaw, B. Palmer +2
We demonstrate the operation of a differential single Cooper-pair box, a charge qubit consisting of two aluminum islands, isolated from ground, coupled by a pair of small-area Jose…
Characterization of a Differential Radio-Frequency Single-Electron Transistor
J. F. Schneiderman, P. Delsing, M. D. Shaw +2
We have fabricated and characterized a new type of electrometer that couples two parallel single-electron transistors (SETs) to a radio-frequency tank circuit for use as a differen…