Generation of entanglement between quantum dot molecule with the presence of phonon effects in a voltage-controlled junction

Abstract

We investigate the generation of entanglement through a quantum dot molecule under the influence of vibrational phonon modes in a bias voltage junction. The molecular quantum dot system is realized by coupled quantum dots inside a suspended carbon nanotube. We consider the dynamical entanglement as a function of bias voltage and temperature by taking into account the electron-phonon interaction. In order to generate the robust entanglement between quantum dots and preserve it to reach the maximal achievable amount steadily, we introduce an asymmetric coupling protocol and apply the easy tunable bias voltage-driven field. For an oscillating bias voltage, the time-varying entanglement can periodically reach the maximum revival. In thermal entanglement dynamics, the phenomena of thermal entanglement degradation and thermal entanglement revival are observed which are intensively affected by the strength of phonon decoherence. The revival of entanglement shows a larger value for a higher phonon coupling.

References in corpus (8)

• Sudden Death of Entanglement
• Many-body localization in periodically driven systems
• Molecular states in carbon nanotube double quantum dots
• Pumping of vibrational excitations in a Coulomb blockaded suspended carbon nanotube
• Photon statistics from a resonantly driven quantum dot
• Driving-dependent damping of Rabi oscillations in two-level semiconductor systems
• Time-dependent quantum transport through an interacting quantum dot beyond sequential tunneling: second-order quantum rate equations
• Geometrical self-testing of partially entangled two-qubit states