Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session L20: Invited Session: Novel Probes for New Physics in AMO Systems |
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Sponsoring Units: DAMOP Chair: Bryce Gadway, University of Illinois at Urbana-Champaign Room: Ballroom B |
Wednesday, March 4, 2015 8:00AM - 8:36AM |
L20.00001: Interferometric probes of many-body localization Invited Speaker: Eugene Demler |
Wednesday, March 4, 2015 8:36AM - 9:12AM |
L20.00002: Quantum distillation and confinement of vacancies in a doublon sea Invited Speaker: David Weiss |
Wednesday, March 4, 2015 9:12AM - 9:48AM |
L20.00003: Probing Quantum Magnetism in 2D with an Array of Hundreds of Trapped Ions Invited Speaker: John Bollinger Quantum simulations using AMO systems promise a new way to experimentally study emergent quantum phenomena, but few systems have demonstrated the capability to control ensembles in which quantum effects cannot be directly computed. The 2D array of 100’s of $^9$Be$^+$ ions in a Penning trap, crystallized in a triangular lattice when laser cooled, is a promising platform for intractable quantum simulations using the $^9$Be$^+$ valence electron spin as a qubit [1]. Spin-dependent forces are employed to modify the strong Coulomb interaction of the ions, mimicking a quantum magnetic interaction. The range of the magnetic interaction can be tuned from infinite to a dipole-dipole like coupling. Combining the application of the spin-dependent force with a transverse magnetic field should lead to the development of quantum correlations between the spins, which can be measured through optical readout of the spin state, both globally and with site-resolved imaging. In this way, trapped atomic ions can be used to probe novel and intractable aspects of quantum magnetism, including the effects of long-range interactions and simulations of quantum non-equilibrium phenomena [2]. In addition to a general overview, I will discuss recent work from a new Penning trap set-up at NIST.\\[4pt] [1] J. W. Britton, et al., Nature 484, 489–492 (2012).\\[0pt] [2] P. Jurcevic, et al., Nature 511, 202 (2014); P. Richerme, et. al., Nature 511, 198 (2014). [Preview Abstract] |
Wednesday, March 4, 2015 9:48AM - 10:24AM |
L20.00004: Quantum atom optics with BEC: Fisher information for entangled non-Gaussian many particle states Invited Speaker: Markus Oberthaler Our results build on the successful generation of spin squeezed states utilizing the quantum dynamics in an interacting two component Bose gas. The initial state is close to an unstable fixed point of the underlying classical system and thus the dynamics leads to squeezing for the initial time (harmonic regime) but generates non-Gaussian states for longer times. With this new method we generate 6dB spin squeezed states on a short time scale. The novel way of squeezing generation also allows the exploration of over-squeezed states i.e. transient non-Gaussian states towards the generation of cat states. We will report on our results preparing and characterizing these transient non-Gaussian states. They reveal variances which are larger than the classical shot noise limit thus suppression of fluctuations cannot be employed as an entanglement witness. We therefore developed a novel method for detecting the presence of entanglement by extracting from the experimentally detected distribution functions a bound of the Fisher information present in the system. With that we confirm that the entanglement is still present although the states are not spin squeezed. Furthermore interferometry beyond classical limits with these novel states is demonstrated by employing maximum likelihood estimation of the interferometric phase. We will also present a general approach which allows the upscaling of squeezed states to large atom numbers by employing the concept -- divide and conquer. We explicitly demonstrate 5dB squeezing for more than 13000 particles. We use this resource and combined this with swapping the squeezing to magnetically sensitive states for demonstration of quantum enhanced magnetometry with high spatial resolution. [Preview Abstract] |
Wednesday, March 4, 2015 10:24AM - 11:00AM |
L20.00005: SU(N) orbital magnetism and synthetic dimensions with two-electron fermions Invited Speaker: Leonardo Fallani I will report on recent experiments performed at LENS with ultracold 173Yb Fermi gases. These two-electron atoms offer a range of new opportunities for quantum simulation with ultracold gases, since they grant the access to two stable degrees of freedom--nuclear spin and electronic state--that can be manipulated independently and coherently. By controlling the electronic state via an ultranarrow clock transition, we have obtained the first demonstration of fast, coherent spin-exchange oscillations between fermionic atoms trapped in two different long-lived electronic orbitals [1]. This result paves the way to the observation of exotic quantum magnetism and of paradigmatic condensed-matter effects in a fermionic system exhibiting SU(N)-invariant interactions. Finally, I will present the results of a very recent experiment, where we have used Raman transitions between different 173Yb nuclear spin states to synthesize an effective lattice dynamics in a finite-sized ``extra dimension.'' By using this innovative approach, we have realized synthetic magnetic fields for effectively-charged fermions and we have demonstrated the emergence of chiral edge states propagating along the edges of the system, thus providing a direct evidence of a prominent feature of quantum Hall physics in condensed-matter systems [2]. \\[4pt] [1] G. Cappellini et al., Direct observation of coherent inter-orbital spin-exchange dynamics, Phys. Rev. Lett. 113, 120402 (2014).\\[0pt] [2] M. Mancini et al., Observation of chiral edge states with neutral fermions in a synthetic Hall ribbon, preprint arXiv:1502.02495 (2015). [Preview Abstract] |
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