Bidirectional Quantum Processor Interfacing by a 4-Kelvin Analog Signal Chain for Superconducting Qubit Control and Quantum State Readout

• URL: http://arxiv.org/abs/2602.14165v1
• Date: Sun, 15 Feb 2026 14:29:06 GMT
• Title: Bidirectional Quantum Processor Interfacing by a 4-Kelvin Analog Signal Chain for Superconducting Qubit Control and Quantum State Readout
• Authors: Deepak R, Lokendra Kanawat, Jayadeep K, Priyesh Shukla,
• Abstract summary: This paper presents a comprehensive cryogenic analog signal processing architecture for superconducting qubit control and quantum state readout.<n>The proposed system implements a complete bidirectional signal path bridging room-temperature digital controllers with quantum processors at millikelvin stages.<n> Simulation results demonstrate successful end-to-end signal integrity with I/Q phase error below 2, image rejection ratio exceeding 35dB, and symbol error rate below $10-6$.
• Score: 0.6116440163779425
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: This paper presents a comprehensive cryogenic analog signal processing architecture designed for superconducting qubit control and quantum state readout operating at 4 Kelvin. The proposed system implements a complete bidirectional signal path bridging room-temperature digital controllers with quantum processors at millikelvin stages. The control path incorporates a Phase-Locked Loop (PLL) for stable local oscillator generation, In-phase/Quadrature (I/Q) modulation for precise qubit gate operations, and a cryogenic power amplifier for signal conditioning. The readout path features a Low Noise Amplifier (LNA) with 14 dB gain and 8-Phase Shift Keying (8-PSK) demodulation for quantum state discrimination. All circuit blocks are designed and validated through SPICE simulations employing cryogenic MOSFET models at 180nm that account for carrier freeze-out, threshold voltage elevation, and enhanced mobility at 4 K. Simulation results demonstrate successful end-to-end signal integrity with I/Q phase error below 2°, image rejection ratio exceeding 35~dB, and symbol error rate below $10^{-6}$. This work provides a modular, simulation-validated framework for scalable cryogenic quantum control systems.

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