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We study the decay of entanglement of quantum dot electron-spin qubits underhyperfine interaction mediated decoherence. We show that two qubit entanglementof a single entangled initial state may exhibit decay characteristic of the twodisentanglement regimes in a single sample, when the external magnetic field ischanged. The transition is manifested by the supression of time-dependententanglement oscillations which are superimposed on the slowly varyingentanglement decay related to phase decoherence (which result in oscillatorybehaviour of entanglement sudden death time as a function of the magneticfield). This unique behaviour allows us to propose the double quantum dottwo-electron spin Bell state as a promising candidate for precise measurementsof the magnetic field.

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