Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session T02: Optomechanics and FoundationsLive

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Chair: Justin Bohnet, Honeywell Room: D133134 
Friday, June 5, 2020 10:30AM  10:42AM Live 
T02.00001: Librational cooling of electricallydriven and opticallylevitated microscopic rotors Denzal Martin, Charles P. Blakemore, Akio Kawasaki, Alexander Fieguth, Nadav Priel, Alexander D. Rider, Giorgio Gratta The permanent electric dipole moment of an opticallylevitated $\sim2.4$ $\mu m$ radius silica microsphere can be driven into rotation by a constant magnitude, rotating electric field. Due to the microsphere's birefringence, some amount of the linearly polarized incident light is coupled into the perpendicular polarization as the microsphere rotates. In the frame of the rotating electric field, the microsphere's dipole moment undergoes libration about the instantaneous direction of the electric field. The power modulation of crosspolarized light transmitted through the microsphere is extracted and processed digitally to obtain the angular speed of the libration. We demonstrate cooling of the libration by applying a phase modulation to the electric field which is proportional to the instantaneous angular speed of the libration. This technique further improves the control over the microsphere's rotational degrees of freedom. [Preview Abstract] 
Friday, June 5, 2020 10:42AM  10:54AM Live 
T02.00002: Dynamics of VibrationCavity Polaritons. Jeffrey Owrutsky, Andrea Grafton, Adam Dunkelberger, Blake Simpkins We recently reported time resolved IR pumpprobe studies on stronglycoupled vibrationcavity polaritons for tungsten hexacarbonyl in hexane in a FabryP\'{e}rot cavity [1]. While much of the response is due to reservoir or uncoupled excited state absorption as well as polariton contraction, a component of the observed signals is due to polariton state evolution. We subsequently used low concentration samples, which reduce the Rabi splitting between the polaritons, to highlight the polariton contraction and demonstrate saturable absorption not only in pump probe measurements but also in single pulse studies.[2] We further investigated this system with twodimensional infrared (2D IR) spectroscopy which provides evidence of hybrid lightmatter polariton evolution and clear indications of direct excitation of dark states.[3] We have further expanded the investigation of vibrational dynamics for strongly coupled vibrationcavity polaritons to another solute, nitroprusside in methanol We explore salient features of the transient response, especially at short delay times, which show aspects of the response that are due to polaritons and are distinguished from uncoupled higher order excitations. [1] A. D. Dunkelberger, et al., Nat. Comm. 7, 13504 (2016). [2] ACS Photonics 6. 2719 (2019). [3] B. Xiang, R. F. Ribeiro, A. D. Dunkelberger, J. Wang, Y. Li, B.S. Simpkins, J.C. Owrutsky, J. YuenZhou, W. Xiong, PNAS 115, 48454850 (2018). [Preview Abstract] 
Friday, June 5, 2020 10:54AM  11:06AM Live 
T02.00003: Quantum decoherence by Coulomb interaction Alexander Stibor, Nicole Kerker, Robin R\"{o}pke, LeaMarina Steinert, Andreas Pooch A basic understanding of the transition from a quantum to a classical state is a fundamental key aspect in quantum physics and described by the theory of decoherence. With the rise of novel techniques and instruments in quantum electronics, the question of decoherence introduced by the Coulomb force between charged particles and an environment becomes highly relevant. Unfortunately, this kind of decoherence mechanism is not well understood yet, several competing theoretical approaches exist. Here, we clarify the current uncertain situation in the literature by performing an experimental decoherence analysis with free electrons in a superposition state aloof a semiconducting and metallic surface in a biprism electron interferometer. The decoherence was determined through a contrast loss at different beam path separations, surface distances and conductibilities. We compared four theoretical models to our data and could rule out three of them. Good agreement was achieved with a theory based on macroscopic quantum electrodynamics. The results will allow the specific calculation and minimization of decoherence channels mediated by the Coulomb force, enabling the design of novel quantum instruments in communication, metrology or microscopy. [Preview Abstract] 
Friday, June 5, 2020 11:06AM  11:18AM Live 
T02.00004: Are Quantum Objects Born with Duality? Xiaofeng Qian, Girish Agarwal Singleparticle twopath interference has been the dominant scenario employed for analyzing and testing quantum waveparticle duality. It can be regarded as a process of regenerating the quantum object (e.g., a photon, an electron, an atom, etc.) with a twocenter source. A natural question arises: will this regeneration process affect the wave and particle natures of the quantum object? To address this question, we analyze the duality property of a photon in relation to the properties of its actual twopoint source, i.e., a pair of nonlocally entangled twolevel atoms. Surprisingly, the photon's duality is found to be solely controlled by the state coherence of the atomic source through an exact Pythagorean relation, $V^2+D^2=\mu^2_S$, where $V$ and $D$ are the single photon's interference visibility and whichway distinguishability respectively and $\mu_S$ is the source state purity. Our analysis opens a new perspective of investigating and understanding quantum duality. [Preview Abstract] 
Friday, June 5, 2020 11:18AM  11:30AM On Demand 
T02.00005: ReducedDensityMatrix Description of Decoherence and Relaxation Processes Involving ElectronSpin Systems Verne Jacobs Electronspin systems are investigated using a quantumopensystems description. Applications of interest include trapped atomic systems in optical lattices, semiconductor quantum dots, and vacancy defect centers in solids. Timedomain and frequencydomain formulations are selfconsistently developed. The general nonperturbative and nonMarkovian formulations can provide a fundamental framework for systematic investigations of corrections to the standard Born and Markov approximations. Attention is given to decoherence and relaxation processes, as well as spectralline broadening phenomena, that are induced as a result of interactions with photons, phonons, nuclear spins, and external electric and magnetic fields. These dissipative phenomena can be described either as coherent interactions or as environmental interactions. The environmental interactions are incorporated by means of the general expressions derived for the timedomain and frequencydomain Liouvillespace selfenergy operators, for which the tetradicmatrix elements are explicitly evaluated in the diagonalresolvent, lowestorder, and Markov (shortmemory time) approximations. [Preview Abstract] 
Friday, June 5, 2020 11:30AM  11:42AM 
T02.00006: Casimir force between two small balls Chen XiaoFan In this paper, the Casimir force between two spheres is studied. [Preview Abstract] 
Friday, June 5, 2020 11:42AM  11:54AM Not Participating 
T02.00007: Some Early 20th Century Physics Formulas Must Add A Rotation And A Vibration Factor Correcting Their Omission Because Their Existence Was Not Known Upon Discovery Stewart Brekke A number of early 20th century formulas must be slightly corrected because since about 1960, all matter has been found to exhibit rotation, vibration as well as linear motion then not known. Einstein derived the total energy at slow speeds to be $E= mc^2 + 1/2mv^2.$ However, adding rotation and vibration factors is now needed .$E= mc^2 + 1/2mv^2 + 1/2I(\omega)^2 +1/2kx^2$ His Photoelectric Effect equation must also include these factors. $ hf= (1/2mv^2 + 1/2I(\omega)^2 + 1/2kx^2)max + \phi.$ In complete and partial transfer of energy in Bremsstrahlung the resulting total photon energy must now be $hf= 1/2mv^2 + 1/2I(\omega)^2 + 1/2kx^2$ for complete braking achievement of the charged particle. Also, in pair production and annihiliation total energy calculations must include rotation and vibration kinetic factors. Many other early physics formulas may possibly need the rotation and vibration factors added also. Mass equation of state may be $E=mc^2 + 1/2mv^2 + 1/2I(\omega)^2 + 1/2kx^2 + kQ_1Q_2/r + Gm_1m_2/r.$ [Preview Abstract] 
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