Non-Ideal Quantum Manipulation

In this thesis, the non-Markovian heat transfer between a quantum system and athermal bath is investigated. Inspired by a recent work, the non-Markovian heat transferbetween a harmonic oscillator and a thermal bath is investigated by time-convolutionlessmaster equation, and the process of establishing system-environment thermal equilibriumis explained. With the application of two fast quantum manipulation methods: quantumZeno effect and bang-bang modulation, it is showed that the system-environment heattransfer could be engineered. From the practice point of view, the bang-bang modulationcould be used to rapidly control the energy of a harmonic oscillator. Furthermore, thesystem-environment energy transfer is investigated in superconducting circuits, and thelasing without inversion effect is explored in this system. In the course of this research,a correction of the model describing the interaction between a flux qubit and electromag-netic fields is introduced, and two coherent effects, such as coexistence of multi-photonprocesses and field-induced quantum Zeno effect, are discussed.Deterministic entangled-photon source is an important device in quantum informa-tion science. Recently, it was showed that the photons emitted by quantum-dot entangledphotonsourcecouldbeonlyclassicalcorrelatedunderlongtimeaverage. Inthisthesis,weshow that frequency of light can be polarization-dependent shifted when it passes throughan electro-optic modulator under voltage ramping. Based on this, we realize polarization-dependent frequency shift and the hidden entanglement in the classical correlation can berevealed. Comparedwithexistingmethods,ourproposalwon'tincreasethecomplexityofthe quantum dot system, and at the same time the efficiency and quality of entanglementis ensured.