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

Monday, April 09, 2018

Peter Grünberg



Our research institute is named after a 2007 Nobel Laureate: Prof. Peter Grünberg. Sadly I heard that Peter Grünberg passed away today.

Peter Grünberg in 1988 discovered giant magnetoresistance (GMR), for which in 2007 together with Albert Fert received the Nobel prize.

Their discovery allowed the storage capacity of hard drives to be significantly increased and made the miniaturization of storage devices. GMR is the sudden change in electrical resistance of a material, made of alternating ferromagnetic and non-magnetic metal layers, when exposed to large magnetic field. If magnetization of neighbouring layers is parallel, electrical resistance heavily drops, however if antiparallel the resistance goes much much higher.  So this makes a large potential barrier between spin up and spin down, which can be used to code information on such a device.