student profile: Miss Marie Claire Jarratt


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Thesis work

Thesis title: New Approaches to Readout of Scaled Quantum Systems

Supervisors: Stephen BARTLETT , David REILLY

Thesis abstract:

As semiconductor spin qubit systems scale in size, we require more efficient methods of performing readout of a quantum state. Bandwidth constraints place a limit on frequency multiplexing techniques, signifying an advantage in a move towards time domain multiplexing, provided measurements could be performed faster than relevant decoherence timescales. While current radio-frequency reflectometry techniques using standard linear HEMT amplifiers have allowed for shorter detection times with low signal-to-noise ratio (SNR), recent progress in superconducting circuits offer further improvements in the form of Josephson parametric amplifiers (JPAs). These devices employ resonant circuits with inherent strong nonlinearites to produce gain with quantum limited amplifier noise. While JPAs achieve quantum limited noise performance, these state-of-the-art devices still suffer from some drawbacks that make them ill-suited for large scale integration; low dynamic range, high sensitivity to magnetic field fluctuations, and complex fabrication requirements. In order to address these shortcomings, a new type of parametric amplifier is proposed based on the nonlinear capacitive coupling between the 2DEG in a GaAs chip and a metallic gate on the surface. By integrating these technologies on single chip, proximal to the semiconductor spin system, readout fidelities and timescales can be greatly improved - a necessity for progress towards large-scale quantum computation.

Selected publications

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Journals

  • Soare, A., Ball, H., Hayes, D., Zhen, X., Jarratt, M., Sastrawan, J., Uys, H., Biercuk, M. (2014). Experimental bath engineering for quantitative studies of quantum control. Physical Review A (Atomic, Molecular and Optical Physics), 89(4), 1-12. [More Information]
  • Soare, A., Ball, H., Hayes, D., Sastrawan, J., Jarratt, M., McLoughlin, J., Zhen, X., Green, T., Biercuk, M. (2014). Experimental noise filtering by quantum control. Nature Physics, 10(11), 825-829. [More Information]
  • Lee, M., Jarratt, M., Marciniak, C., Biercuk, M. (2014). Frequency stabilization of a 369 nm diode laser by nonlinear spectroscopy of Ytterbium ions in a discharge. Optics Express, 22(6), 7210-7221. [More Information]

2014

  • Soare, A., Ball, H., Hayes, D., Zhen, X., Jarratt, M., Sastrawan, J., Uys, H., Biercuk, M. (2014). Experimental bath engineering for quantitative studies of quantum control. Physical Review A (Atomic, Molecular and Optical Physics), 89(4), 1-12. [More Information]
  • Soare, A., Ball, H., Hayes, D., Sastrawan, J., Jarratt, M., McLoughlin, J., Zhen, X., Green, T., Biercuk, M. (2014). Experimental noise filtering by quantum control. Nature Physics, 10(11), 825-829. [More Information]
  • Lee, M., Jarratt, M., Marciniak, C., Biercuk, M. (2014). Frequency stabilization of a 369 nm diode laser by nonlinear spectroscopy of Ytterbium ions in a discharge. Optics Express, 22(6), 7210-7221. [More Information]

Note: This profile is for a student at the University of Sydney. Views presented here are not necessarily those of the University.