2013/04/30 by Paweł Mazurek, Katarzyna Roszak, Ravindra W. Chhajlany +1
Computer Science · Physics and Astronomy · #Bell state #Condensed matter physics #Magnetic field #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum decoherence #Quantum dot #Quantum electrodynamics #Quantum entanglement #Quantum mechanics #Qubit #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #W state #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physreva.89.062318
published as Phys. Rev. A 89, 062318 (2014) · 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
arxiv created 2013/09/12 · openalex publication_date 2014/06/17 · arxiv updated 2014/06/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 external magnetic 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 decoherence which results in oscillatory behavior of entanglement sudden death time as a function of the magnetic field. This unique behavior allows us to propose the double-quantum-dot two-electron spin Bell state as a promising candidate for precise measurements of the magnetic field.