Now showing items 21-25 of 25

    • Rapid Single-Shot Measurement of a Singlet-Triplet Qubit 

      Barthel, Christian; Reilly, David; Marcus, Charles Masamed; Hanson, M. P.; Gossard, Arthur (American Physical Society, 2009)
      We report repeated single-shot measurements of the two-electron spin state in a GaAs double quantum dot. The readout allows measurement with a fidelity above 90% with a ∼7  μs cycle time. Hyperfine-induced precession between ...
    • Relaxation and Dephasing in a Two-Electron \(^{13}C\) Nanotube Double Quantum Dot 

      Churchill, Hugh Olen Hill; Kuemmeth, Ferdinand; Harlow, Jennifer W.; Bestwick, Andrew J.; Rashba, Emmanuel; Flensberg, Karsten; Stwertka, Carolyn H.; Taychatanapat, Thiti; Watson, Susan K.; Marcus, Charles Masamed (American Physical Society, 2009)
      We use charge sensing of Pauli blockade (including spin and isospin) in a two-electron \(^{13}C\) nanotube double quantum dot to measure relaxation and dephasing times. The relaxation time \(T_1\) first decreases with a ...
    • 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 ...
    • Silicon Nanoparticles as Hyperpolarized Magnetic Resonance Imaging Agents 

      Aptekar, Jacob W.; Cassidy, Maja Clare; Johnson, Alexander C.; Barton, Robert A.; Lee, Menyoung; Ogier, Alexander C.; Vo, Chinh; Anahtar, Melis Nuray; Yin, Ren; Bhatia, Sangeeta; Ramanathan, Chandrasekhar; Cory, David G.; Hill, Alison Lynn; Mair, Ross W.; Rosen, Matthew Scot; Walsworth, Ronald L.; Marcus, Charles Masamed (American Chemical Society, 2009)
      Magnetic resonance imaging of hyperpolarized nuclei provides high image contrast with little or no background signal. To date, in vivo applications of prehyperpolarized materials have been limited by relatively short nuclear ...