Spin-photon coupling using circular double quantum dots
(2026) In Physical Review B 113(11).- Abstract
We propose and analyze a microwave spin-photon interface based on a circular double quantum dot, inspired by recent experimental observations of anisotropic g-factors and orbital ring states in InAs nanowires. We develop an effective theoretical model, capturing the interplay of spin-orbit coupling and the magnetic flux, and show how ring states form at crossings of odd and even geometric parity orbital states. Similar to bonding and antibonding states of conventional double quantum dots, the ring states can be changed into single dot states by detuning the dots, which enables a high degree of control over the system’s properties. Applying a tilted magnetic field induces spin-charge hybridization which enables spin-photon coupling. For... (More)
We propose and analyze a microwave spin-photon interface based on a circular double quantum dot, inspired by recent experimental observations of anisotropic g-factors and orbital ring states in InAs nanowires. We develop an effective theoretical model, capturing the interplay of spin-orbit coupling and the magnetic flux, and show how ring states form at crossings of odd and even geometric parity orbital states. Similar to bonding and antibonding states of conventional double quantum dots, the ring states can be changed into single dot states by detuning the dots, which enables a high degree of control over the system’s properties. Applying a tilted magnetic field induces spin-charge hybridization which enables spin-photon coupling. For low disorder, the photons couple states of simultaneously (almost) opposite spin and angular momentum. With increasing disorder, the spin-photon coupling becomes analogous to the flopping mode mechanism of conventional double quantum dots with intrinsic spin-orbit coupling where the spin is hybridized with the bonding and antibonding orbital states. We show that the system exhibits a third-order charge-noise sweet spot at a specific magnetic field angle, which lowers the system’s sensitivity to dephasing while retaining a substantial spin-photon coupling strength. Moreover, the photon coupling mechanism can be switched off either electrically, by detuning to the single-dot regime, or magnetically, by rotating the field to disable the spin-charge hybridization.
(Less)
- author
- Omlor, Ferdinand LU ; Boström, Florinda Viñas LU and Leijnse, Martin LU
- organization
- publishing date
- 2026-03-27
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 113
- issue
- 11
- article number
- 115306
- publisher
- American Physical Society
- external identifiers
-
- scopus:105034620365
- ISSN
- 2469-9950
- DOI
- 10.1103/QTFZ-3RH9
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © (2026), (American Physical Society). All rights reserved.
- id
- bad320b8-0f79-44a0-8903-266e0cab4bcd
- date added to LUP
- 2026-05-26 16:06:51
- date last changed
- 2026-05-26 16:07:25
@article{bad320b8-0f79-44a0-8903-266e0cab4bcd,
abstract = {{<p>We propose and analyze a microwave spin-photon interface based on a circular double quantum dot, inspired by recent experimental observations of anisotropic g-factors and orbital ring states in InAs nanowires. We develop an effective theoretical model, capturing the interplay of spin-orbit coupling and the magnetic flux, and show how ring states form at crossings of odd and even geometric parity orbital states. Similar to bonding and antibonding states of conventional double quantum dots, the ring states can be changed into single dot states by detuning the dots, which enables a high degree of control over the system’s properties. Applying a tilted magnetic field induces spin-charge hybridization which enables spin-photon coupling. For low disorder, the photons couple states of simultaneously (almost) opposite spin and angular momentum. With increasing disorder, the spin-photon coupling becomes analogous to the flopping mode mechanism of conventional double quantum dots with intrinsic spin-orbit coupling where the spin is hybridized with the bonding and antibonding orbital states. We show that the system exhibits a third-order charge-noise sweet spot at a specific magnetic field angle, which lowers the system’s sensitivity to dephasing while retaining a substantial spin-photon coupling strength. Moreover, the photon coupling mechanism can be switched off either electrically, by detuning to the single-dot regime, or magnetically, by rotating the field to disable the spin-charge hybridization.</p>}},
author = {{Omlor, Ferdinand and Boström, Florinda Viñas and Leijnse, Martin}},
issn = {{2469-9950}},
language = {{eng}},
month = {{03}},
number = {{11}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Spin-photon coupling using circular double quantum dots}},
url = {{http://dx.doi.org/10.1103/QTFZ-3RH9}},
doi = {{10.1103/QTFZ-3RH9}},
volume = {{113}},
year = {{2026}},
}