A Cryo-CMOS Low-Power Semi-Autonomous Transmon Qubit State Controller in 14-nm FinFET Technology
A Cryo-CMOS Low-Power Semi-Autonomous Transmon Qubit State Controller in 14-nm FinFET Technology
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采用 14 nm FinFET 技术的 Cryo-CMOS 低功耗半自主 Transmon 量子位状态控制器
DOI：
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发表时间：
2022
影响因子：
5.4
通讯作者：
D. Friedman
中科院分区：
文献类型：
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作者：
S. Chakraborty;D. Frank;K. Tien;Pat Rosno;M. Yeck;J. Glick;R. Robertazzi;R. Richetta;J. Bulzacchelli;D. Underwood;Daniel Ramirez;Dereje Yilma;Andrew Davies;R. Joshi;Shawn D. Chambers;S. Lekuch;K. Inoue;Dorothy Wisnieff;C. Baks;D. Bethune;John Timmerwilke;T. Fox;Peilin Song;Blake R. Johnson;Brian P. Gaucher;D. Friedman
报道了一种用于超导transmon量子比特半自主控制的可扩展、非复用低温14 nm FinFET量子比特状态控制器（QSC）。QSC包括一个增强型通用数字处理器，该处理器支持波形生成和相位旋转操作，并结合基于低功耗电流模式单边带上变频<inline-formula><tex-math notation="LaTeX">${I}/{Q}$混频器</tex-math></inline-formula>的RF任意波形发生器（AWG）。QSC采用14 nm CMOS FinFET技术实现，在4.5-5.5 GHz目标频率范围内生成控制信号，在500 MHz信号带宽下实现> 50 dB的无杂散动态范围（SFDR）。当控制器工作在低温恒温器的4K工作台上，并连接到低温恒温器的毫开尔文工作台上的transmon量子比特时，测得transmon<inline-formula><tex-math notation="LaTeX"></tex-math></inline-formula><inline-formula><tex-math notation="LaTeX">的</tex-math></inline-formula>相干时间分别为75.7 μ和73 <inline-formula><tex-math notation="LaTeX">μ ext{s}$</tex-math></inline-formula>，在每种情况下与使用常规室温（RT）控制获得的结果相当。在对transmons的进一步测试中，每个Clifford门的量子比特限制错误率为7.76 × 10−4，再次与使用RT控制的结果相当。QSC的最大RF输出功率为−18 dBm，主动控制下的每量子位功耗为23 mW。
A scalable, non-multiplexed cryogenic 14-nm FinFET quantum bit (qubit) state controller (QSC) for use in the semi-autonomous control of superconducting transmon qubits is reported. The QSC includes an augmented general-purpose digital processor that supports waveform generation and phase rotation operations combined with a low-power current-mode single sideband upconversion <inline-formula> <tex-math notation="LaTeX">${I}/{Q}$ </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">$T_{1}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$T_{2}$ </tex-math></inline-formula> coherence times were 75.7 and 73 <inline-formula> <tex-math notation="LaTeX">$mu ext{s}$ </tex-math></inline-formula>, 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.