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Sensitivity of entanglement decay of quantum-dot spin qubits to the external magnetic field

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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DOI:
Digital Object Identifier (open in new tab) 10.1103/PhysRevA.89.062318
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Copyright (2014 American Physical Society)

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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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