HQOC/ITAMP Joint Quantum Sciences Seminar
Wednesday, February 11, 2015
4:00 PM, Jefferson 250
Prof. Eugene Polzik, University of Copenhagen
Measurements Beyond The Heisenberg Uncertainties
Some operations on quantum states are not restricted by the Heisenberg uncertainty
principle. One example is teleportation, which allows for both the position and the
momentum be transferred without added noise [1]. Perhaps even more surprisingly, a
trajectory of an oscillator can be measured with an accuracy exceeding the Heisenberg
uncertainty in both position and momentum following the approach we have recently
developed [2]. The key feature is to monitor
the oscillator trajectory in a quantized reference frame with a negative mass with which
the oscillator is entangled. In the talk I will first present a magnetic spin oscillator
with an effective negative mass and report the results of tracing the oscillator
trajectory and entanglement assisted measurements of magnetic field [3]. I will then
describe experimental progress towards tracing a trajectory of a mechanical oscillator
with the precision not restricted by the Heisenberg uncertainty principle following the
proposal [4].
1. H. Krauter et al. Nature Phys., 9, 400 (2013).
2. E.S. Polzik and K. Hammerer, Ann. Phys. (Berlin) 527, No. 1–2, A15–A20 (2015).
3. G. Vasilakis et al, to appear in Nature Phys.; W. Wasilewski et al. Phys. Rev. Lett.,
104, 133601 (2010).
4. K. Hammerer, M. Aspelmeyer, E.S. Polzik, P. Zoller. Phys. Rev. Lett. 102, 020501
(2009).
Peter Komar, Lukin Lab
Entangling optical clocks via Rydberg blockade
Postdoc Presentation begins at 4:00 PM
Refreshments are served from 4:10-4:30 PM
Guest Presentation begins at 4:30 PM
Karl Coleman
HQOC Laboratory Administrator
Faculty Assistant to Profs. Greiner and Lukin
Harvard University
Department of Physics
17 Oxford Street
Cambridge, MA 02138
P: (617) 496-2544
F: (617) 496-2545
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