Bulletin of the American Physical Society
47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 61, Number 8
Monday–Friday, May 23–27, 2016; Providence, Rhode Island
Session H2: Invited Session: Cold Atoms in Optical CavitiesInvited
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Chair: Murray Holland, JILA Room: Ballroom B |
Wednesday, May 25, 2016 10:30AM - 11:00AM |
H2.00001: Cavity Quantum Electrodynamics: A Universal Quantum Optics Toolbox Invited Speaker: Gerhard Rempe Electromagnetic resonators provide unparalleled capabilities in controlling the interaction between light and matter. The recently developed techniques for trapping and cooling atoms between closely spaced mirrors now open up new experimental avenues for genuine quantum-mechanical experiments. Particularly exciting possibilities concern long-distance quantum networking and scalable quantum computation. Recent achievements like the nondestructive detection of an optical photon [1], the realization of a quantum gate between a single atom and a single photon [2], and the heralded and efficient conversion of a flying qubit into a stationary qubit [3] are past highlights. The longstanding dream of a quantum gate between individually addressable photonic qubits might become reality in the future. The talk will summarize recent experiments and give an outlook onto future directions. \newline \newline [1] A. Reiserer et al., Science 342, 1349 (2013). \newline [2] A. Reiserer, et al., Nature 508, 237 (2014). \newline [3] N. Kalb, et al., PRL 114, 220501 (2015). [Preview Abstract] |
Wednesday, May 25, 2016 11:00AM - 11:30AM |
H2.00002: Breaking Quantum and Thermal Limits on Precision Measurements Invited Speaker: James K. Thompson I will give an overview of our efforts to use correlations and entanglement between many atoms to overcome quantum and thermal limits on precision measurements. In the first portion of my talk, I will present a path toward a 10000 times reduced sensitivity to the thermal mirror motion that limits the linewidth of today's best lasers. By utilizing narrow atomic transitions, the laser's phase information is primarily stored in the atomic gain medium rather than in the vibration-sensitive cavity field. To this end, I will present the first observation of lasing based on the mHz linewidth optical-clock transition in a laser-cooled ensemble of strontium atoms. In the second portion of my talk, I will describe how we use collective measurements to surpass the standard quantum limit on phase estimation $1/\sqrt{N}$ for $N$ unentangled atoms. We achieve a directly observed reduction in phase variance relative to the standard quantum limit of as much as 17.7(6) dB. [Preview Abstract] |
Wednesday, May 25, 2016 11:30AM - 12:00PM |
H2.00003: Entangled states of spin and clock oscillators Invited Speaker: Eugene Polzik Measurements of one quadrature of an oscillator with precision beyond its vacuum state uncertainty have occupied a central place in quantum physics for decades. We have recently reported the first experimental implementation of such measurement with a magnetic oscillator [1]. However, a much more intriguing goal is to trace an oscillator trajectory with the precision beyond the vacuum state uncertainty in \textit{both} position and momentum, a feat naively assumed not possible due to the Heisenberg uncertainty principle. We have demonstrated that such measurement is possible if the oscillator is entangled with a quantum reference oscillator with an effective negative mass [2,3]. The key element is the cancellation of the back action of the measurement on the composite system of two oscillators. Applications include measurements of e.-m. fields, accelleration, force and time [4] with practically unlimited accuracy. In a more general sense, this approach leads to trajectories without quantum uncertainties and to achieving new fundamental bounds on the measurement precision. \begin{enumerate} \item G. Vasilakis et al. \textit{Nature} \quad \textit{Phys}$.$, ~(2015) doi:10.1038/nphys3280. \item K. Hammerer et al. \textit{Phys. Rev. Lett.} 102, 020501 (2009). \item E.S. Polzik and K.Hammerer. \textit{Annalen der Physyk}. 527, No. 1--2, A15--A20 (2015). \item E. S. Polzik and J. Ye. doi: 10.1103/PhysRevA.93.021404 (2016). \end{enumerate} [Preview Abstract] |
Wednesday, May 25, 2016 12:00PM - 12:30PM |
H2.00004: Collective atomic motion and spin dynamics in a driven optical cavity Invited Speaker: Dan Stamper-Kurn Cavity quantum electrodynamics generally highlights the interchange of quantum noise and information between light and matter. I will discuss experiments in which the collective motion and spin of a trapped gas of ultracold atoms interact with and are detected by light in a single mode of a high-finesse optical cavity. I will present recent results on quantum-limited force detection, on the damping and amplification of Larmor precession through dynamical backaction, and on cavity-induced coupling between mechanical oscillators and between spin and motional degrees of freedom. [Preview Abstract] |
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