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Towards quantum-noise limited multiplexed microwave readout of qubits

机译：迈向量子噪声受限的量子位多路复用微波读取

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Coherent circuits based on superconducting elements hold tremendous promise for the practical implementation of quantum information technology: advanced computation, cryptography, and hardware simulation of complex materials systems are envisioned applications. Such circuits are essentially engineered atoms with level transitions in the 4-8 GHz regime; as such “read” and “write” operations are performed with the aid of fast microwave pulses and low-noise amplifiers, respectively. Recent advances in cavity-based superconducting parametric amplifiers have enabled real-time measurement and feedback in one and two qubits. We demonstrate a novel Josephson junction transmission-line based traveling-wave amplifier which employs sub-wavelength phase matching resonators to achieve high gain, several GHz of bandwidth, and near quantum-noise limited performance. Such devices will enable multiplexed qubit readout in integrated architectures comprised of a variety of microwave frequency analog and digital superconducting technologies: signal sources, multiplexers, ADCs, DACs, mixers, and amplifiers.
机译：基于超导元件的相干电路为量子信息技术的实际实现提供了广阔的前景：复杂材料系统的高级计算，密码学和硬件仿真是可预见的应用。这样的电路本质上是经过工程改造的原子，具有在4-8 GHz范围内的电平转换。这样，“读”和“写”操作分别借助于快速微波脉冲和低噪声放大器来执行。基于腔的超导参数放大器的最新进展使得能够在一个和两个量子位中进行实时测量和反馈。我们演示了一种新颖的基于约瑟夫逊结传输线的行波放大器，该放大器采用亚波长相位匹配谐振器来实现高增益，几GHz带宽和接近量子噪声的受限性能。这样的设备将能够在由多种微波频率模拟和数字超导技术组成的集成架构中实现多路量子比特读取：信号源，多路复用器，ADC，DAC，混频器和放大器。

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