Theoretical Quantum Optics



Theoretical Quantum Optics

We theoretically investigate quantum behavior of light, mechanical, and generally bosonic systems. The goal is to bring such systems into interaction with electronic and spin states of the matter and build-up hybrid quantum systems. Such hybrid systems are beneficial in exploration of quantum foundation and can be employed in quantum technologies, such as quantum sensors and quantum communications.

Quantum Optomechanics

From the beginning of the millennium, ability in fabrication of nanomechanical systems from one hand and tremendous progress in control and assembly of micro and nano sized cavities, on the other hand, has brought the scientist inevitably to their hybridization. Giving birth to the field of quantum optomechanics. Such systems have so far attained many successes regarding quantum mechanical behaviors in light–mechanics. From the ground state cooling of macroscopic mirrors to microwave–mechanical entanglement. Yet, there are many fields to be explored.

One of our goals in the theoretical quantum optics group is to propose and provide recipe for employing novel opto-, electro-, and spin-mechanical systems in exploration of foundational quantum theories.

 

 

Related publications:

  1. Mehdi Abdi, Matthias Pernpeintner, Rudolf Gross, Hans Huebl, and Michael J. Hartmann, Phys. Rev. Lett. 114, 173602 (2015).
  2. Mehdi Abdi, Peter Degenfeld-Schonburg, Mahdi Sameti, Carlos Navarrete-Benlloch, and Michael, J. Hartmann, Phys. Rev. Lett. 116, 233604 (2016).
  3. Ali Asadian and Mehdi Abdi, Phys. Rev. A 93, 052315 (2016).

 

Color centers

hBN-Illumination.pngWide band gap solids like diamond are transparent in their pristine form. However, some point defects can introduce inter-band-gap energy levels that can support narrow frequency optical transitions and emit light quanta, hence the color centers. Such emitters have recently been observed in layered hexagonal boron nitride (hBN) material. The emissions from hBN membranes are not fully understood, yet.

Hence, one of our ongoing projects is studying the origins of these emissions by means of ab initio computations and group theory analysis. We then propose systems that exploit the electronic and spin properties of the emitters in quantum technology.

 

 

 

Related publications:

  1.  Mehdi Abdi, Myung-Joong Hwang, Mortaza Aghtar, and Martin B. Plenio, Phys. Rev. Lett. 119, 233602 (2017).
  2.  Mehdi Abdi, Jyh-Pin Chou, Adam Gali, and Martin B. Plenio, arXiv:1709.05414 [cond-mat.mes-hall] (2017).

 

Quantum Information Processing

CVQIP.pngSecure quantum communication, quantum simulation, and quantum computation are the quantum theory gifts that have to be fully exploited. There are various strategies on this way. They can be basically divided into discrete variable (finite Hilbert space dimension) and continuous variable (infinite Hilbert space dimension) methods. Each of which possess their advantages and disadvantages. This have brought physicist to a third strategy; the hybrid DV–CV approach.

In our group, we are working on DV, CV, and hybrid quantum information processing systems and protocols from quantum repeaters to quantum simulators.

 

 

 

 

Related Publications:

  1. Mehdi Abdi, Stefano Pirandola, Paolo Tombesi, and David Vitali, Phys. Rev. Lett. 109, 143601 (2012).
  2. Mehdi Abdi, Stefano Pirandola, Paolo Tombesi, and David Vitali, Phys. Rev. A 89, 022331 (2014).

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