Quantum dynamics of optical phonons generated by optical excitation of a quantum dot

Abstract

The study of the fundamental properties of phonons is crucial to understand their role in applica- tions in quantum information science, where the active use of phonons is currently highly debated. A genuine quantum phenomenon associated with the fluctuation properties of phonons is squeezing, which is achieved when the fluctuations of a certain variable drop below their respective vacuum value. We consider a semiconductor quantum dot in which the exciton is coupled to phonons. We review the fluctuation properties of the phonons, which are generated by optical manipulation of the quantum dot, in the limiting case of ultra short pulses. Then we discuss the phonon properties for an excitation with finite pulses. Within a generating function formalism we calculate the corre- sponding fluctuation properties of the phonons and show that phonon squeezing can be achieved by the optical manipulation of the quantum dot exciton for certain conditions even for a single pulse excitation where neither for short nor for long pulses squeezing occurs. To explain the occurrence of squeezing we employ a Wigner function picture providing a detailed understanding of the induced quantum dynamics.

References in corpus (6)

• Propagating phonons coupled to an artificial atom
• A Quantum-Enhanced Prototype Gravitational-Wave Detector
• Dynamic modulation of photonic crystal nanocavities using gigahertz acoustic phonons
• Dynamic Acoustic Control of Individual Optically Active Quantum Dot-like Emission Centers in Heterostructure Nanowires
• Enhanced sequential carrier capture into individual quantum dots and quantum posts controlled by surface acoustic waves
• Influence of pulse width and detuning on coherent phonon generation

Cited by in corpus (7)

• Coherent control theory and experiment of optical phonons in diamond
• Enhancement of the Raman Effect by Infrared Pumping
• Controlling Photoluminescence Spectra of hBN Color Centers by Selective Phonon-Assisted Excitation: A Theoretical Proposal
• Orientational order parameters for arbitrary quantum systems
• Influence of excited state decay and dephasing on phonon quantum state preparation
• Photon scattering from a quantum acoustically modulated two-level system
• Master equations for Wigner functions with spontaneous collapse and their relation to thermodynamic irreversibility