Quantum Optics and Quantum Information Group

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Research Interests

Main topics Research overview

 

The main topics addressed in theoretical research of the UFSCar group are:

 Radiation-matter interaction

 Foundations of the quantum theory

Quantum measurement, Statistical properties of radiation,  Nonlocality phenomena, Loophole-free test of the Bell's inequalities,  Open quantum systems and decoherence

 Schemes for decoherence control

Coupled quantum systems,  Pumping schemes,  Reservoir engineering

 Physical implementations of quantum computation/communication processes

 Quantum Information

Distinguishability of states,   Separability of states

 Engineering, manipulation and measurement (reconstruction) of quantum states and entanglement

 

These topics are developed in various physical systems such as cavity quantum electrodynamics, ion traps, Bose-Einstein condensates, optical lattices, running wave fields.
Besides the above topics other themes are investigated individually by the group members.


Research Overview

Continuous photodetection model

The continuous photodetection model (CPM) describes photon counting processes in cavities. It includes the back-reaction of the detector on the field upon each photon detection, allowing for quantum control via feedback schemes.

Our group is interested in proposing experimental schemes to verify CPM and studying applications of CPM in cavity QED. Besides, we work out theoretically the form of the Quantum Jump operator, which describes the back-reaction of the detector on the field.

See : [1], [2], [3], [4], [5], [6], [7], [8], [9]

   

Modelling Quantum Jumps

We work out a microscopic model of single-photon detectors to determine the quantum jump operator, which describes the field state immediately after a single photon absorption (detection). We also determine the back-reaction on the field due to dark counts.

 

See: [1], [2], [3]

   

Dynamical Casimir Effect

We study photon creation from vacuum due to the Dynamical (Non-stationary) Casimir effect (DCE). We are interested in proposing experimental schemes to verify DCE, so we work out a model for dissipative losses in non-stationary quantum systems.

We also study entanglement dynamics, decoherence and non-classical state generation during DCE.

See recent papers (2005-): [1], [2], [3], [4], [5], [6], [7], [8]