Low power cryo-CMOS design for quantum computing applications

#circuits #silicon #cryo #quantum

This talk will cover practical challenges for cryogenic CMOS designs for next generation quantum computing. Starting from system level, it will detail the design considerations for a non-multiplexed, semi-autonomous, transmon qubit state controller (QSC) implemented in 14nm CMOS FinFET technology. The QSC includes an augmented general-purpose digital processor that supports waveform generation and phase rotation operations combined with a low power current-mode single sideband upconversion I/Q mixer-based RF arbitrary waveform generator (AWG). Implemented in 14nm CMOS FinFET technology, the QSC generates control signals in its target 4.5GHz to 5.5 GHz frequency range, achieving an SFDR > 50dB for a signal bandwidth of 500MHz.  With the controller operating in the 4K stage of a cryostat and connected to a transmon qubit in the cryostat’s millikelvin stage, measured transmon T₁ and T₂ coherence times were 75.7μs and 73μs, respectively, in each case comparable to results achieved using conventional room temperature controls. In further tests with transmons, a qubit-limited error rate of 7.76x10^-4 per Clifford gate is achieved, again comparable to results achieved using room temperature controls. The QSC’s maximum RF output power is -18 dBm, and power dissipation per qubit under active control is 23mW.

• Date: 27 Sep 2023
• Time: 05:00 PM to 06:00 PM
• All times are (UTC-04:00) Eastern Time (US & Canada)
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• University of Toronto
• 255 Huron Street
• Toronto, Ontario
• Canada M5S 1A7
• Building: McLennan Physical Laboratories
• Room Number: MP 103
• Click here for Map

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• Starts 18 September 2023 10:42 PM
• Ends 27 September 2023 06:00 PM
• All times are (UTC-04:00) Eastern Time (US & Canada)
• No Admission Charge

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