On-chip Parametric Amplification in a Double Quantum Dots Circuit

• URL: http://arxiv.org/abs/2603.18666v1
• Date: Thu, 19 Mar 2026 09:29:40 GMT
• Title: On-chip Parametric Amplification in a Double Quantum Dots Circuit
• Abstract summary: In microwave-based quantum circuits, such as double quantum dots (DQDs), superconducting qubits and spin qubits, parametric amplifiers are indispensable.<n>Here, we demonstrate an on-site single-atom parametric amplifier (SAPA) within a reconfigurable quantum circuit.
• Score: 6.78776618337146
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: In microwave-based quantum circuits, including double quantum dots (DQDs), superconducting qubits and spin qubits, parametric amplifiers are indispensable in achieving high-fidelity qubit readouts. Despite its importance, the application of parametric amplifiers is hampered by several challenges, such as high insertion losses, constrained tunability, and a pronounced vulnerability to magnetic fields. Here, we demonstrate an on-site single-atom parametric amplifier (SAPA) within a reconfigurable quantum circuit, which consists of a superconducting microwave cavity and two GaAs gate-defined DQDs. Leveraging the inherent nonlinearity of the DQD, a parametric gain exceeding 11 dB is achieved. This gain contributes to enhance the qubit readout, as evidenced by exceeding two times improvement in the signal-to-noise ratio (SNR) when employing the DQD-based amplifier for reading out another DQD. Our work not only presents a versatile experimental platform with enhanced readout capabilities in quantum computing, but also introduces alternative choices of parametric amplifiers for a variety of microwave-based quantum circuits.

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