Influence of excited state decay and dephasing on phonon quantum state preparation

Abstract

The coupling between single-photon emitters and phonons opens many possibilities to store and transmit quantum properties. In this paper we apply the independent boson model to describe the coupling between an optically driven two-level system and a discrete phonon mode. Tailored optical driving allows not only to generate coherent phonon states, but also to generate coherent superpositions in the form of Schrödinger cat states in the phonon system. We analyze the influence of decay and dephasing of the two-level system on these phonon preparation protocols. We find that the decay transforms the coherent phonon state into a circular distribution in phase space. Although the dephasing between two exciting laser pulses leads to a reduction of the interference ability in the phonon system, the decay conserves it during the transition into the ground state. This allows to store the phonon quantum state properties in the ground state of the single-photon emitter.

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• Orientational order parameters for arbitrary quantum systems
• Photon scattering from a quantum acoustically modulated two-level system
• Novel hermetically sealed device to realize unconventional phonon blockade at near-micron dimensions and milli Kelvin temperatures
• Entropy Dynamics of Phonon Quantum States Generated by Optical Excitation of a Two-Level System
• Master equations for Wigner functions with spontaneous collapse and their relation to thermodynamic irreversibility
• Quantum dot exciton dephasing by Coulomb interaction. A fermionic analogue of the independent boson model