Challenges and Opportunities for Development of Ultra-Low Power Scaled Quantum Computing Systems

This talk will cover practical challenges for the development of integrated system designs for next-generation quantum computing, combining integrated circuits, systems, and microwave engineering. Starting from the system level, it will detail design considerations for non-multiplexed, semi-autonomous transmon qubit state controllers implemented in 14 nm CMOS FinFET technology. The controller includes an augmented general-purpose digital processor supporting waveform generation and phase rotation, combined with a low-power current-mode single-sideband conversion I/Q mixer-based RF arbitrary waveform generator. The QSC generates control signals in the 4.5 to 5.5 GHz range with SFDR greater than 50 dB for 500 MHz bandwidth. With the controller operating at the 4 K stage of a cryostat and connected to a transmon qubit in the millikelvin stage, measured T1 and T2 coherence times were 75.5 us and 73 us, respectively. Further tests achieved a qubit-limited error rate of 7.76 x 10^-4 per Clifford gate, comparable to conventional room-temperature controls. The talk will also present an improved low-power design version and clocking solutions for large arrays.
Speaker(s): , Dr. Sudipto Chakraborty
Agenda:
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Room: 2529, Bldg: DWE, Univerisity of Waterloo, Waterloo, Ontario, Canada, N2L 3G1, Virtual: https://events.vtools.ieee.org/m/576513