Tuesday, February 19, 2019

New Physics talk

Recently I was invited to give a Quantum Information Seminar at Physics department of Syarcuse University, NY. There was a broad audience from high energy physics to cosmology, quantum chemistry, gravity and black holes and quantum computation, both experimentalists and theorists. My talk was about a new correspondence we found recently between physics and information. Below you can find my abstract, for questions contact me. 


New Physics from Quantum Information Theory by Dr. Mohammad Ansari

Jan 17, 2019 at 11:00 AM - 12:00 PM
Room: 202 Physics Bldg.
In quantum physics physical quantities are linear in density matrix, e.g. energy, current, spin, etc. However, this is not the case in quantum information theory as  informational measures are nonlinear functions in density matrix; examples are entropy, fidelity loss, purity, etc.  Is there any way to measure information in the lab using physical quantities? This is an important question that I’ll address in this talk. I’ll present a new correspondence between entropy and physical quantities. I will  discuss how this correspondence may introduce new physics in quantum heat engines, quantum computation, black holes, etc..

Dr. Mohammad Ansari, Julich Research Center, Germany
Host: Britton Plourde. Contact: Yudaisy Salomon Sargenton - phyadmin@syr.edu

Monday, October 08, 2018

Donna Strickland


The lady who taught us nonlinear optics in Waterloo during my PhD studies just received a Nobel Prize in Physics! Dr Donna Strickland is nice, honest, and down-to-earth modest, such that I  could not shamefully believe that she is better than others! She was excellent teacher also and was delivering science very well to students, and always with a taste of sweetness!

Her story of being so humble remind me of the following poem by Emily Dickinson:
I'm Nobody! Who are you?
Are you -Nobody- too?
Then there's a pair of us!
Don't tell! they'd...
...


Thursday, September 27, 2018

Postdoctoral Researcher in Quantum Information and Thermodynamics



The institute of Theoretical Nanoelectronics (PGI-2) concerns itself with investigating structure formation in condensed matter, starting on electronic length and time scales while bearing in mind macroscopic consequences. These studies are closely connected in diverse ways with experimental work within the institute, and also with projects in other institutes at Forschungszentrum Jülich.

The main focus of our work is placed on the electronic structure of solids, in particular with regard to their importance in information technology and cooperative phenomena in condensed matter. Research questions here concern dynamic structure formation processes together with the statistical mechanics of order and disorder processes. Special topics in the field of complex fluids deal with the structure and dynamics of soft matter.
We are looking to recruit as soon as possible a

Postdoctoral Researcher in Quantum Information and Thermodynamics

Your Job:
  • studying quantum heat engines in presence of enviornmental disturbance
  • understanding information-to-work process in superconductiong quantum computational devices
  • studying the analogue of fluctuation-dissipation theorem in quantum theory
Your Profile:
  • PhD degree (or nearly graduating) in theoretical condensed matter physics or a related field
  • Preference will be given to cadidates with background experience in Quantum computation, condensed matter, statistical mechanics, and related Topics. Strong candidates from other fields are encouraged to apply
  • Ability and willingness to work in an international, interdisciplinary and distributed teams as well as to assume responsibility
Our Offer:
  • a varied and challenging area of ​​responsibility in an interdisciplinary team
  • Exciting work setting on an attractive research campus with a very good infrastructure, ideally situated within the city triangle of Cologne, Düsseldorf, and Aachen
  • A comprehensive further training programme, including German language courses
  • Flexible working hours and various opportunities to reconcile work and family life
  • Limited for 1 years with possible longer-term prospects
  • Full-time position with the option of slightly reduced working hours
  • Salary and social benefits in conformity with the provisions of the Collective Agreement for the Civil Service (TVöD)

Forschungszentrum Jülich aims to employ more women in this area and therefore particularly welcomes applications from women.

We also welcome applications from disabled persons.





See our webpage to apply

Wednesday, September 12, 2018

Postdoctoral research on Quantum Information and Thermodynamics

Exact correspondences between seemingly different concepts play an important role in all fields of physics. An example is the fluctuation-dissipation theorem, which states that linear response of a system to external driving force corresponds to system fluctuations and this initiated important developments. Owing to technological miniaturization, nowadays quantum systems can be probed and controlled to high accuracy. However, theoretical efforts to identify quantum phenomena in thermodynamics are stalled by the difficulty of defining basic quantum quantities, such as heat flow, entropy production, work, and temperature. Recently using quantum information techniques Nazarov and Ansari developed a new correspondence in physics to extend the fluctuation-dissipation theorem into the realm of quantum systems.

To further study and test this new correspondence the theory group of Jülich-Aachen Research Alliance (JARA) at Peter Grünberg Institute in Germany is looking for highly motivated candidates to fill a postdoc position over the next few months.The project will be supervised by Dr. Ansari, and may involve collaborations with leading experimental groups.

Candidates with a PhD degree (or nearly graduating) in theoretical condensed matter physics or a related field can apply. Preference will be given to candidates with experience in background in quantum computation, condensed matter, statistical mechanics, and related topics, but strong candidates from other fields are encouraged to apply.

The application material should include:

• CV & transcripts
• names & emails of 3 referees

If interested, please submit your files to m.ansari@fz-juelich.de. Review of applications will start in September and will continue until the position is filled.

Sunday, July 08, 2018

Exact quantization of superconducting circuits

Another paper on transmon qubits is out. In this paper:

We present a theoretical description for circuits consisting of weak anharmonic qubits coupled to cavity multimodes. We obtain a unitary transformation that diagonalizes harmonic sector of the circuit. Weak anharmonicity does not alter the normal mode basis, however it can modify energy levels. We study two examples of a transmon and two transmons coupled to bus resonator, and we determine dressed frequencies and Kerr nonlinearities in closed form formulas. Our results are valid for arbitrary frequency detuning and coupling within and beyond dispersive regime. (M.H. Ansari)

arXiv:1807.00792