Planned research - Properties of Coherently Prepared Media (Quantum-state engineering)

Positions to be opened: 1 PhD student, 1 MSc student

One principal objective of quantum technologies and quantum-state engineering is the development of methods for efficient creation of specific quantum states of a given physical system and for their controlled modification. Our previous work on CPM resulted in elaboration of efficient methods for generation of superpositions of quantum states with given magnetic quantum numbers. Lifetimes of such superpositions reach 100 ms (they are significantly longer than offered by other methods), which opens new application perspectives. For example, multidimensional quantum 'bits' of information, the so-called qudits, can be generated and modified with magneto-optical methods and, in some cases, they may replace systems of coupled quantum bits. This would significantly prolongue time for storing and processing of the quantum information.

Our work on quantum-state engineering will begin by the preparation of a setup allowing selective creation of superpositions of states differing in their m quantum numbers by Δm = 2, 4, and 6. Such superpositions are difficult to create, as they need multiphoton interactions between laser light and sample. Nevertheless, our team with the Berkeley and Riga partners developed a suitable efficient experimental technique for their creation. The method exploits characteristic spatial symmetries of the angular momenta in atoms associated with a given superposition. The specific symmetry also enables selective detection of the associated qudit. Application of external magnetic and rf fields will allow engineering of such objects, hence tailoring of the magneto-optical properties of a coherently prepared sample. One PhD student will be hired for this work. One MSc student is foreseen to help with these tasks, particularly with the setup preparation. The second student, working in the following years, will take over the duties and will participate in the measurements.

Our project will aim at developing practical applications of CPM for measurements of the magnetic fields comparable to the Earth field. The physical background for such applications has been laid by our earlier work. Development of the practical applications will require designing of novel apparatus, e.g. for laser frequency stabilization, fast light modulation, and signal detection. These challenges will require skilled and creative postdoc researcher. Adapting the existing setup for measurements in unshielded environment and preparation of field measurements with the magnetometer will be the task for one MSc student.

This task will require involvement of one PhD student and one MSc student.

We will cooperate on this subject with the our partners at D. Budker's, G. Djotyan's, and M. Auzinsh's groups.