Instrument and measurement automation for classical control of a multi-qubit quantum processor
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Typ
Examensarbete för masterexamen
Program
Publicerad
2019
Författare
KRIŽAN, CHRISTIAN
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The recent field of quantum computing has seen great progress in the development of multi-qubit
systems, with qubit usability lifetimes increasing, putting practical quantum computers on the
near-horizon. As these systems take shape, scalability becomes of high priority as implementable
algorithms require a multitude of qubits to function. Such systems will require precise timing
control using instrument platforms for their development to continue. In this thesis, I develop and
present such an instrument platform solution. This platform consists of automated instrument
drivers written for Zurich Instruments’ HDAWG arbitrary waveform generator and UHFQA lockin
amplifier i.e. classical electronic control systems. The drivers are integrated in the experimentcontrol
software Labber, and verified by characterising a multi-qubit quantum processor loaded
with a two-qubit DUT. One qubit is further characterised using the drivers, with extracted values
of interest including: the qubit frequency, f01, located at 4.302665 GHz ± 3.916MHz; the -pulse
amplitude,
, of 721mV ± 20mV; and the energy relaxation time, T1, of ~57.6 μs. The platform
is then benchmarked in terms of duration times for typical events in a running experiment, such
as Labber-to-instrument connection times (2 603 ms and 2 328 ms for the UHFQA and HDAWG
respectively), compilation times (632 ms and 1 288 ms), and finally also waveform data upload
times to the instruments (764 ms and 1 481 ms). The platform control was optimised in terms of
upload speed, using a memory injection technique for the HDAWG. The upload time was reduced
to 131 ms, typically demonstrating an averaged improvement of >91% (131 ms vs. 1 481 ms).
Finally, I discuss some observed potential for improvement, and speculate as to the onwards outlook
regarding the future of the delivered instrument automation platform.
Beskrivning
Ämne/nyckelord
quantum , processor , superconducting , Python , spectroscopy , Bloch , qubit , resonator , dispersive , Rabi