Substrate-controlled dynamics of spin qubits in low dimensional van der Waals materials

We report a theoretical study of the coherence dynamics of spin qubits in two-dimensional materials (2DMs) and van der Waals heterostructures, as a function of the host thickness and the composition of the surrounding environment. We focus on MoS2 and WS2, two promising systems for quantum technolog...

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Bibliographic Details
Published in:Applied physics letters 2021-04, Vol.118 (15)
Main Authors: Onizhuk, Mykyta, Galli, Giulia
Format: Article
Language:English
Subjects:
Applied physics
Coherence
Composition
Heterostructures
Quantum mechanics
Quantum sensors
Qubits (quantum computing)
Spin dynamics
Substrates
Thickness
Two dimensional materials
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Summary:We report a theoretical study of the coherence dynamics of spin qubits in two-dimensional materials (2DMs) and van der Waals heterostructures, as a function of the host thickness and the composition of the surrounding environment. We focus on MoS2 and WS2, two promising systems for quantum technology applications, and we consider the decoherence arising from the interaction of the spin qubit with nuclear spins. We show that the Hahn-echo coherence time is determined by a complex interplay between the source of decoherence in the qubit host and in the environment, which in turn determines whether the noise evolution is in a classical or quantum mechanical regime. We suggest that the composition and thickness of van der Waals heterostructures encapsulating a qubit host can be engineered to maximize coherence times. Finally, we discuss how quantum sensors may be able to probe the dynamics of the nuclear bath in 2DMs.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0048399