IQIM Postdoctoral and Graduate Student Seminar

Friday November 30, 2018 12:00 PM

Student Session - Joe Iverson, Gautam Venugopalan

Speaker: Student Session
Location: East Bridge 114

This week's seminar features two short talks.

Joe Iverson, Graduate Student, Preskill Group
Title: Coherence in logical quantum channels
Abstract: In quantum error correcting codes, there is a distinction between coherent and incoherent noise. Coherent noise can cause the infidelity to accumulate quadratically when a fixed channel is applied many times in succession, rather than linearly as in the case of incoherent noise. I will describe how to characterize coherent noise and show how coherence can survive after we apply error correction in a stabilizer quantum code. Finally, I will argue that in the toric code, the logical noise channel becomes incoherent as the code becomes large.
Joint work with John Preskill.

Gautam Venugopalan, Graduate Student, LIGO

Title: Optomechanics for next generation terrestrial gravitational wave detectors
Abstract:
With the dawn of gravitational wave astronomy, black-hole and neutron star spectroscopy are within reach of the next generation of terrestrial gravitational wave detectors. Optical loss is a major limiting factor in realizing sensitivity improvements - but if we can exploit the ponderomotive interaction at audio-band frequencies, the sensitivity could be improved by a factor of a few at frequencies between 100 Hz and 3 kHz. In this talk, I'll describe the work that is being done at the Caltech 40m prototype interferometer in testing out schemes for harnessing optomechanics for gravitational wave detectors.

 

Series IQIM Postdoctoral and Graduate Student Seminar Series

Contact: Marcia Brown at 626-395-4013 marciab@caltech.edu