Threshold Schemes from Isogeny Assumptions
Luca De Feo, Michael Meyer
PKC 2020
A scalable, non-multiplexed cryogenic 14-nm FinFET quantum bit (qubit) state controller (QSC) for use in the semi-autonomous control of superconducting transmon qubits is reported. 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 mixer-based RF arbitrary waveform generator (AWG). Implemented in the 14-nm CMOS FinFET technology, the QSC generates control signals in its target 4.5-5.5-GHz-frequency range, achieving an spurious free dynamic range (SFDR) > 50 dB for a signal bandwidth of 500 MHz. With the controller operating in the 4 K stage of a cryostat and connected to a transmon qubit in the cryostat's millikelvin stage, measured transmon and coherence times were 75.7 and 73 , respectively, in each case comparable to results achieved using conventional room temperature (RT) controls. In further tests with transmons, a qubit-limited error rate of 7.76 × 10-4 per Clifford gate is achieved, again comparable to the results achieved using RT controls. The QSC's maximum RF output power is -18 dBm, and power dissipation per qubit under active control is 23 mW.
Luca De Feo, Michael Meyer
PKC 2020
Luca De Feo, Nadia El Mrabet, et al.
IACR Transactions on Cryptographic Hardware and Embedded Systems
Ward Beullens
CRYPTO 2022
Micha Moffie, Omer Boehm, et al.
arXiv