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Abstract
We study the decay of entanglement of quantum-dot electron-spin qubits under hyperfine-interaction-mediated decoherence.We show that two-qubit entanglement of a single entangled initial state may exhibit decay characteristic of two disentanglement regimes in a single sample, when the externalmagnetic field is changed. The transition is manifested by the suppression of time-dependent entanglement oscillations which are superimposed on the slowly varying entanglement decay related to phase decoherencewhich results in oscillatory behavior of entanglement sudden death time as a function of the magnetic field. This unique behavior allows us to propose the doublequantum- dot two-electron spin Bell state as a promising candidate for precise measurements of themagnetic field.
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Authors (4)
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Paweł Mazurek
- Uniwersytet Gdański Wydział Fizyki
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Katarzyna Roszak
- Uniwersytet Wrocławski Wydział Fizyki
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Ravindra W. Chhajlany
- Uniwersytet w Poznaniu .
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevA.89.062318
- License
- Copyright (2014 American Physical Society)
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PHYSICAL REVIEW A
no. 89,
pages 1 - 7,
ISSN: 2469-9926 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Mazurek P., Roszak k., Chhajlany R., Horodecki P.: Sensitivity of entanglement decay of quantum-dot spin qubits to the external magnetic field// PHYSICAL REVIEW A. -Vol. 89, (2014), s.1-7
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physreva.89.062318
- Verified by:
- Gdańsk University of Technology
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