2010/01/09 by Matthias Steffen, Shwetank Kumar, David DiVincenzo +6
Computer Science · Physics and Astronomy · #Charge qubit #Cold Atom Physics and Bose-Einstein Condensates #Computer science #Flux qubit #Josephson effect #Microwave #Phase qubit #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum mechanics #Qubit #Superconducting quantum computing #Superconductivity #Telecommunications #Transmission line #cond-mat.supr-con
paper · pdf · doi:10.1063/1.3354089
arxiv created 2010/01/09 · openalex publication_date 2010/03/08 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a readout scheme for phase qubits which eliminates the read-out superconducting quantum interference device so that the entire qubit and measurement circuitry only require a single Josephson junction. Our scheme capacitively couples the phase qubit directly to a transmission line and detects its state after the measurement pulse by determining a frequency shift observable in the forward scattering parameter of the readout microwaves. This readout is extendable to multiple phase qubits coupled to a common readout line and can in principle be used for other flux biased qubits having two quasistable readout configurations.