Publications Repository - Gdańsk University of Technology

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.

Authors

• Paweł Mazurek,
• Katarzyna Roszak,
• Ravindra W. Chhajlany,
• prof. dr hab. Paweł Horodecki link open in new tab