Effective boson-spin model for nuclei ensemble based universal quantum memory

Abstract

We study the collective excitation of a macroscopic ensemble of polarized nuclei fixed in a quantum dot. Under the approximately homogeneous condition that we explicitly present in this paper, this many-particle system behaves as a single mode boson interacting with the spin of a single conduction band electron confined in this quantum dot. Within this effective spin-boson system, the quantum information carried by the electronic spin can be coherently transferred into the collective bosonic mode of excitation in the ensemble of nuclei. In this sense, the collective bosonic excitation can serve as a stable quantum memory to store the quantum information of spin state of electron.

8 pages, 3 figures, new contents added

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• Quantum information storage and state transfer based on spin systems
• EIT-like phenomenon with two atomic ensembles in a cavity
• Spin entanglement induced by spin-orbit interactions in coupled quantum dots
• Analog of Electromagnetically Induced Transparency Effect for Two Nano/Micro-mechanical Resonators Coupled With Spin Ensemble
• Molecular Ensemble Based Remote Quantum Storage for Charge Qubit via Quasi-Dark State
• Long-range adiabatic quantum state transfer through a tight-binding chain as a quantum data bus
• Indirect driving of cavity QED system and its induced non-linearity
• Creation of Entanglement between Two Electron Spins Induced by Many Spin Ensemble Excitations
• Cooling Torsional Nanomechanical Vibration by Spin-Orbit Interactions