Sensitivity of the decay of entanglement of quantum dot spin qubits to the 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 the two disentanglement regimes in a single sample, when the external magnetic field is changed. The transition is manifested by the supression of time-dependent entanglement oscillations which are superimposed on the slowly varying entanglement decay related to phase decoherence (which result in oscillatory behaviour of entanglement sudden death time as a function of the magnetic field). This unique behaviour allows us to propose the double quantum dot two-electron spin Bell state as a promising candidate for precise measurements of the magnetic field.

Improved version, title modified, Fig 2 corrected, references added, both the scientific content and the conclusions unchanged. Article: 5 pages, 2 figures; supplementary materials, 3 pages, 2 figures

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• Ultimate entanglement robustness of two-qubit states against general local noises
• Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve
• The relation between the quantum discord and quantum teleportation: the physical interpretation of the transition point between different quantum discord decay regimes
• Oscillating properties of a two-electron quantum dot in the presence of a magnetic field
• A measure of qubit environment entanglement for pure dephasing evolutions
• Detection of entanglement during pure dephasing evolutions for systems and environments of any size
• Multiple re-encounter approach to radical pair reactions and the role of nonlinear master equations
• The decay of quantum correlations between quantum dot spin qubits and the characteristics of its magnetic field dependence
• Qubit-environment entanglement outside of pure decoherence: hyperfine interaction
• 3D two-electron double quantum dot: comparison between the behavior of some physical quantities under two different confinement potentials in the presence of a magnetic field
• Decoherence enhanced quantum measurement of a quantum dot spin qubit
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• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots
• Retardation of entanglement decay of two spin qubits by quantum measurements
• A Non-Convex Optimization Strategy for Computing Convex-Roof Entanglement