Multilevel effects in quantum dot based parity-to-charge conversion of Majorana box qubits
(2021) In Physical Review B 103(24).- Abstract
Quantum dot based parity-to-charge conversion is a promising method for reading out quantum information encoded nonlocally into pairs of Majorana zero modes. To obtain a sizable parity-to-charge visibility, it is crucial to tune the relative phase of the tunnel couplings between the dot and the Majorana modes appropriately. However, in the presence of multiple quasidegenerate dot orbitals, it is in general not experimentally feasible to tune all couplings individually. This paper shows that such configurations could make it difficult to avoid a destructive multiorbital interference effect that substantially reduces the readout visibility. We analyze this effect using a Lindblad quantum master equation. This exposes how the... (More)
Quantum dot based parity-to-charge conversion is a promising method for reading out quantum information encoded nonlocally into pairs of Majorana zero modes. To obtain a sizable parity-to-charge visibility, it is crucial to tune the relative phase of the tunnel couplings between the dot and the Majorana modes appropriately. However, in the presence of multiple quasidegenerate dot orbitals, it is in general not experimentally feasible to tune all couplings individually. This paper shows that such configurations could make it difficult to avoid a destructive multiorbital interference effect that substantially reduces the readout visibility. We analyze this effect using a Lindblad quantum master equation. This exposes how the experimentally relevant system parameters enhance or suppress the visibility when strong charging energy, measurement dissipation, and, most importantly, multiorbital interference is accounted for. In particular, we find that an intermediate-time readout could mitigate some of the interference-related visibility reductions affecting the stationary limit.
(Less)
- author
- Schulenborg, Jens ; Burrello, Michele ; Leijnse, Martin LU and Flensberg, Karsten
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 103
- issue
- 24
- article number
- 245407
- publisher
- American Physical Society
- external identifiers
-
- scopus:85108022122
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.103.245407
- language
- English
- LU publication?
- yes
- id
- 0ed4d61a-178e-4e97-b557-a6bd7ef6071c
- date added to LUP
- 2021-07-15 14:14:53
- date last changed
- 2023-11-08 16:27:57
@article{0ed4d61a-178e-4e97-b557-a6bd7ef6071c,
abstract = {{<p>Quantum dot based parity-to-charge conversion is a promising method for reading out quantum information encoded nonlocally into pairs of Majorana zero modes. To obtain a sizable parity-to-charge visibility, it is crucial to tune the relative phase of the tunnel couplings between the dot and the Majorana modes appropriately. However, in the presence of multiple quasidegenerate dot orbitals, it is in general not experimentally feasible to tune all couplings individually. This paper shows that such configurations could make it difficult to avoid a destructive multiorbital interference effect that substantially reduces the readout visibility. We analyze this effect using a Lindblad quantum master equation. This exposes how the experimentally relevant system parameters enhance or suppress the visibility when strong charging energy, measurement dissipation, and, most importantly, multiorbital interference is accounted for. In particular, we find that an intermediate-time readout could mitigate some of the interference-related visibility reductions affecting the stationary limit. </p>}},
author = {{Schulenborg, Jens and Burrello, Michele and Leijnse, Martin and Flensberg, Karsten}},
issn = {{2469-9950}},
language = {{eng}},
number = {{24}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Multilevel effects in quantum dot based parity-to-charge conversion of Majorana box qubits}},
url = {{http://dx.doi.org/10.1103/PhysRevB.103.245407}},
doi = {{10.1103/PhysRevB.103.245407}},
volume = {{103}},
year = {{2021}},
}