Path integral simulation of exchange interactions in CMOS spin qubits

Abstract

The boom of semiconductor quantum computing platforms created a demand for computer-aided design and fabrication of quantum devices. Path integral Monte Carlo (PIMC) can have an important role in this effort because it intrinsically integrates strong quantum correlations that often appear in these multi-electron systems. In this paper we present a PIMC algorithm that estimates exchange interactions of three-dimensional electrically defined quantum dots. We apply this model to silicon metal-oxide-semiconductor (MOS) devices and we benchmark our method against well-tested full configuration interaction (FCI) simulations. As an application, we study the impact of a single charge trap on two exchanging dots, opening the possibility of using this code to test the tolerance to disorder of CMOS devices. This algorithm provides an accurate description of this system, setting up an initial step to integrate PIMC algorithms into development of semiconductor quantum computers.

arXiv comment10 pages , 5 figures

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Cited by in corpus (4)

• Bounds to electron spin qubit variability for scalable CMOS architectures
• A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling
• Low Depth Phase Oracle Using a Parallel Piecewise Circuit
• Ab initio modelling of quantum dot qubits: Coupling, gate dynamics and robustness versus charge noise