Now showing items 1-5 of 5

    • Fast Sensing of Double-Dot Charge Arrangement and Spin State with a Radio-Frequency Sensor Quantum Dot 

      Barthel, Christian; Kjærgaard, M.; Medford, James Redding; Stopa, Michael P; Marcus, Charles Masamed; Hanson, M. P.; Gossard, Arthur C. (American Physical Society, 2010)
      Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb ...
    • Quantum-Dot-Based Resonant Exchange Qubit 

      Medford, J; Beil, J.; Taylor, J. M.; Rashba, Emmanuel; Lu, H.; Gossard, A. C.; Marcus, C. M. (American Physical Society (APS), 2013)
      We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf ...
    • Relaxation and readout visibility of a singlet-triplet qubit in an Overhauser field gradient 

      Barthel, C; Medford, James Redding; Bluhm, H.; Yacoby, Amir; Marcus, C; Hanson, M. P.; Gossard, A. C. (American Physical Society (APS), 2012)
      Using single-shot charge detection in a GaAs double quantum dot, we investigate spin relaxation time (T1) and readout visibility of a two-electron singlet-triplet qubit following single-electron dynamic nuclear polarization ...
    • Self-Consistent Measurement and State Tomography of an Exchange-Only Spin Qubit 

      Medford, J; Beil, J.; Taylor, J. M.; Bartlett, S. D.; Doherty, A. C.; Rashba, Emmanuel; DiVincenzo, D. P.; Lu, H.; Gossard, A. C.; Marcus, C (Nature Publishing Group, 2013)
      Quantum-dot spin qubits characteristically use oscillating magnetic or electric fields, or quasi-static Zeeman field gradients, to realize full qubit control. For the case of three confined electrons, exchange interaction ...
    • Spin Qubits in Double and Triple Quantum Dots 

      Medford, James Redding (2013-10-08)
      This thesis presents research on the initialization, control, and readout of electron spin states in gate defined GaAs quantum dots. The first three experiments were performed with Singlet-Triplet spin qubits in double ...