Circuit Model for the Efficient Co-Simulation of Spin Qubits and their Control & Readout Circuitry

In the past years, individual electron spins confined in quantum dots have emerged as a promising candidate for realizing qubits, in view of their good scalability potential and relatively long decoherence times. Due to the recent advancements in qubit device technologies, the quantum system stack levels above the device level are becoming increasingly more relevant. However, quantum systems necessitate very specific requirements on the classical electronics that control and monitor the qubits, requiring good design tools for the co-design of the qubits with their associated electronics. We propose a circuit model for a spin qubit to facilitate this co-design. Our model includes readout via a resonator, single-qubit quantum gates based on electron spin resonance techniques and two-qubit quantum gates based on the spin exchange interaction. The model is also able to include qubit decoherence and handle the effects of nonideal control signals on the qubit. The spin qubit model can be completely simulated in Spectre (R), thereby opening up possibilities for co-designing qubit-specific electronics in a commonly used simulation environment.