Microwave-multiplexed qubit controller using adiabatic superconductor logic

• URL: http://arxiv.org/abs/2310.06544v3
• Date: Mon, 3 Jun 2024 12:21:09 GMT
• Title: Microwave-multiplexed qubit controller using adiabatic superconductor logic
• Authors: Naoki Takeuchi, Taiki Yamae, Taro Yamashita, Tsuyoshi Yamamoto, Nobuyuki Yoshikawa,
• Abstract summary: Cryogenic qubit controllers (QCs) are the key to build large-scale superconducting quantum processors. We report on a scalable QC using an ultra-low-power superconductor logic family, namely adiabatic quantum-flux-parametron logic. The AQFP-mux QC produces multi-tone microwave signals for qubit control with an extremely small power dissipation of 81.8 pW per qubit.
• Score: 0.7300072111359807
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Cryogenic qubit controllers (QCs) are the key to build large-scale superconducting quantum processors. However, developing scalable QCs is challenging because the cooling power of a dilution refrigerator is too small (~10 $\mu$W at ~10 mK) to operate conventional logic families, such as complementary metal-oxide-semiconductor logic and superconducting single-flux-quantum logic, near qubits. Here we report on a scalable QC using an ultra-low-power superconductor logic family, namely adiabatic quantum-flux-parametron (AQFP) logic. The AQFP-based QC, referred to as the AQFP-multiplexed QC (AQFP-mux QC), produces multi-tone microwave signals for qubit control with an extremely small power dissipation of 81.8 pW per qubit. Furthermore, the AQFP-mux QC adopts microwave multiplexing to reduce the number of coaxial cables for operating the entire system. As a proof of concept, we demonstrate an AQFP-mux QC chip that produces microwave signals at two output ports through microwave multiplexing and demultiplexing. Experimental results show an output power of approximately $-$80 dBm and on/off ratio of ~40 dB at each output port. Basic mixing operation is also demonstrated by observing sideband signals.

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