[Emeriti-faculty] Reminder: Colloquium at 3:00 today Friday, 11/6/09

[Gayle Grant <gayle grant tufts edu>]

Good afternoon:

There is a Department of Physics and Astronomy Colloquium today Friday, 
11/6/09 at 3:00 pm in Robinson 253. Faculty and Graduate students are 
encouraged to attend.


TUFTS UNIVERSITY
Physics and Astronomy Colloquium

Photon Manipulation of Spins and Sensitive Detection by On-chip Methods


Irinel Chiorescu.
Florida State University and
National High Magnetic Field Laboratory

Manipulation of quantum information allows certain algorithms to be 
performed at unparalleled speeds. Photons are an ideal choice to 
manipulate qubits as they interact with quantum systems in predictable 
ways. They are a versatile tool for manipulating, reading/coupling 
qubits and for encoding/transferring quantum information over long 
distances. In this talk I will discuss recent advancements in our 
laboratory that regards spin detection and manipulation by single and 
multi-photons resonant activation. Using an Electron Spin Resonance 
cavity, we operated a two-level and a six-level system by means of 
single as well as multi-photon coherent Rabi oscillations.[1,2] For the 
study of nanosized samples, we have implemented an on-chip SQUID 
detection method able to measure spin systems in large magnetic fields. 
Also, microwave transmission through an on-chip superconducting cavity 
and measured by a heterodyne system is developed for the same purpose. 
Aside spin sensing, these techniques demonstrate fine ability in 
detecting properties of superconducting materials. Observation of the 
nonlinear Meissner effect (NLME), a long-sought variety of the known 
Meissner effect, is demonstrated for the first time as a function of the 
magnitude and the orientation of a parallel magnetic field.[3]. It is 
proposed to use such “NLME angular spectroscopy” to probe unconventional 
pairing symmetries in superconductors.

[1] S. Bertaina, L. Chen, N. Groll, J. Van Tol, N.S. Dalal, I. 
Chiorescu, PRL 102, 050501 (2009)
[2] S. Nellutla, K.-Y. Choi, M. Pati, J. van Tol, I. Chiorescu, N. S. 
Dalal, PRL 99, 137601 (2007)
[3] N. Groll, A. Gurevich, I. Chiorescu, arXiv: 0908.4097, submitted to 
PRL.

November 6, 2009
3:00 pm
Robinson Hall, Room 253

Refreshments served in Robinson 251 at 2:30 pm