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

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

by Giulia Galli, Mykyta Onizhuk

QIS

coherence time

Collection(s):

EFRC NPQC

Principal Investigators:

Giulia Galli

Published In:

Applied Physics Letters 118, 154003 (2021)

Cite:

10.6084/m9.figshare.14348129

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Abstract:

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.

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Figure/Table	Properties	Files
	Coherence time	substrates_full.pdf
	2D materials, coherence time, heterostructure	csand_full.pdf
	Noise autocorrelation	cnoise.pdf
	Pseudospin	pseudospin.pdf
	Coherence time

Datasets

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Description	Files
Data for coherence limited by Au substrate	Au
Data for coherence limited by Si substrate	Si
Data for coherence limited by SiC substrate	SiC
Data for coherence limited by SiO2 substrate	SiO2
Data for coherence limited by 2DMs with varied thickness	bare_materials
Data for coherence limited by hBN	hbn
Data for coherence limited by C substrate in MoS2 heterostructures	mos2_c
Data for coherence limited by C substrate in WS2 heterostructures	ws2_c

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Kind	Details
Software	Package Name: pyCCE Version: 0.2

Scripts

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Description	Files
Script for computing the contribution of Au substrate	au_only.py
Script for computing the contribution of Si substrate	si_only.py
Script for computing the contribution of SiC substrate	sic_only.py
Script for computing the contribution of SiO2 substrate	sio2_only.py
Script for computing the contribution of WS2 2DM	ws2_only.py
Script for computing the contribution of MoS2 2DM	mos2_only.py
Script for computing the contribution of C substrate in MoS2 heterostructure	c_without_mos2.py
Script for computing the contribution of C substrate in WS2 heterostructure	c_without_ws2.py
Script for computing the pseudospins dynamics	pseudospins.py
Script for computing the noise autocorrelation function for C substrate	noise_corr.py

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Curator Information

Name:

Mykyta Onizhuk

Email Address:

onizhuk@uchicago.edu

Affiliation:

Department of Chemistry, University of Chicago

File Server Information

File Server Path:

https://notebook.rcc.uchicago.edu/files/onizhuk_apl_2021

License

The work presented here is licensed under a Creative Commons Attribution 4.0 International License (CC BY)