Jinoh Jung

Jinoh Jung

Affiliation: Samsung Electronics

Title: A Hybrid Computational Model for Simulating Single-Atom Spin Resonance Scanning Tunneling Microscope

Abstract: Accurate simulation of quantum computing hardware is crucial forits development. For single atom qubits controlled by an Electron SpinResonance Scanning Tunneling Microscope (ESR-STM), a key challenge is modellingthe unique noise environment. Conventional simulation frameworks like QiskitAer excel at modeling intrinsic quantum noise but cannot adequately capture thequasi-static, inhomogeneous noise that arises from the time-averagedmeasurement process and magnetic instability of the spin-polarized STM tip. Toaddress this gap, we introduce a hybrid simulation model that combines QiskitAer’s quantum error channels for homogeneous noise (T₁, T₂)with a classical Lorentzian probability distribution representing theinhomogeneous dephasing (T₂^*). The model was validatedthrough simulations of Rabi, Ramey and Hahn echo sequences. Critically, theHahn echo simulation demonstrated the successful refocusing of thisinhomogeneous noise, revealing the much longer intrinsic coherence time. Theseresults are in good agreement with the reference experiment, validating thephysical accuracy of our model. The successful separation of these distinctnoise mechanisms confirms that our hybrid approach provides a more physically completeand realistic model of the ESR-STM system, offering a valuable framework forcreating high-fidelity simulations of specific quantum hardware.