Dear colleagues,
this week we are happy to have Leigh Norris from Dartmouth University and former student
of Ivan Deutsch, UNM, as speaker at our seminar.
Kind regards,
Richard and Swati
ITAMP Topical Lunch Discussion
Date: Friday, April 24th
Time: 12:00-1:30 pm
Pizza will be served.
Location: B-106 @ Center for Astrophysics (60 Garden Street)
Directions: after entering the lobby of the CfA, turn right to enter the hallway of the B
building. In the hallway, turn right again, and B-106 is there.
Speaker: Leigh Norris, Dartmouth University
Title: Internal Spin Control and Squeezing in Ensembles of Alkali Atoms
Abstract: Spin squeezed states have applications in metrology and quantum information
processing. While there has been significant progress in producing spin squeezed states
and understanding their properties, most spin squeezing research to date has focused on
ensembles of two-level systems or qubits. We explore squeezed state production in an
ensemble of spin f>1/2 alkali atoms (qudits). The Faraday effect, which couples the
collective spin of the atomic ensemble and the polarization modes of an optical field, can
be used to mediate entangling interactions between the atoms that generate spin squeezing.
This process can be enhanced with further control of the atomic qudits. Initial state
preparation increases the collective squeezing through enhancement of resolvable quantum
fluctuations, but comes at a price of increased decoherence. We find an optimal state
preparation, achieving increased squeezing while remaining robust to decoherence. After
the collective interaction, qudit control maps the generated entanglement to different
pseudo-spin subspaces where it is metrologically useful, e.g., the clock transition or the
stretched state for magnetometry. In the latter case, additional internal control can be
used to squeeze the individual atoms, further enhancing the total squeezing in a
multiplicative manner. These considerations highlight the unique capabilities of our
platform: we are able to transfer coherences and correlations between subspaces to explore
a wider variety of nonclassical states with ultimate application in sensors or other
quantum information processors.
---------------------------
Dr. Richard Schmidt
Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP)
Harvard-Smithsonian Center for Astrophysics MS-14
60 Garden St.
Cambridge, MA 02138
U.S.A.
richard.schmidt(a)cfa.harvard.edu
Tel. +1 (617) 496-7610
Fax +1 (617) 496-7668
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