Bulletin of the American Physical Society
50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019; Milwaukee, Wisconsin
Session N06: Hybrid Quantum Systems |
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Chair: Brian Sawyer, Georgia Tech Room: Wisconsin Center 102DE |
Thursday, May 30, 2019 8:00AM - 8:12AM |
N06.00001: Improved optical cavity design for a microwave-mechanical-optical transducer Maxwell Urmey, Benjamin Brubaker, Peter Burns, Sarang Mittal, Andrew Higginbotham, Konrad Lehnert, Cindy Regal A quantum-coherent transducer between optical and microwave frequencies could integrate superconducting qubits into a spatially distributed quantum network by exploiting the ability of optical fields to transmit quantum information over long distances. By coupling an optical Fabry-Perot cavity and a microwave LC resonator to the same MHz-frequency mechanical mode of a SiN membrane, we have developed a converter with 47\% efficiency and 38 photons of added noise [1]. This talk will treat a portion of the noise which currently prohibits quantum operation, that associated with optical heating of the superconducting circuit. Improvements to the optical cavity are designed to reduce this noise and loss in the optical cavity. \medskip \newline [1] Higginbotham, A. P., et. al. ``Harnessing electro-optic correlations in an efficient mechanical converter,” Nature Physics 14, 1038-1042 (2018) [Preview Abstract] |
Thursday, May 30, 2019 8:12AM - 8:24AM |
N06.00002: A new experimental setup for investigation of cold molecule-Rydberg-atom interactions Martin Zeppenfeld A quantum hybrid system composed of polar molecules and Rydberg atoms has been suggested for a wide variety of applications, including cooling of internal and external molecular degrees of freedom, nondestructive molecular state readout, and quantum information processing. However, to date no experiments in any of these directions have been performed.\\ In my talk I will present the status and plans for a new experimental setup to investigate interactions between cold molecules and cold Rydberg atoms. Slow molecular beams produced by velocity filtering will interact with Rydberg atoms excited from cold atoms in a magnetooptical trap. This will allow us to enter a previously unexplored low energy regime for molecule-Rydberg-atom interactions. In this regime, pure dipole-dipole interactions should dominate, with substantially enhanced cross-sections and dramatically reduced resonance widths for resonant energy transfer between the two systems compared to previous measurements at room temperature~[1]. Moreover, we hope to demonstrate molecule-Rydberg-atom interactions as an efficient means to nondestructively detect polar molecules, possibly including heralded nondestructive detection of single molecules.\\ \noindent[1] F. Jarisch {\it et al.} NJP {\bf 20}, 113044 (2018) [Preview Abstract] |
Thursday, May 30, 2019 8:24AM - 8:36AM |
N06.00003: Quantum Optomechanics with Superfluid Helium Yogesh Patil, Jiaxin Yu, Sean Frazier, Jack Harris Superfluid Helium has in recent years been demonstrated to be a very good platform to realize quantum optomechanics owing to its extremely low losses, both optical (it combines a $\approx $19eV bandgap with a near total absence of chemical or structural defects) and mechanical (it has zero viscosity) [1]. Moreover, it offers access to the qualitatively novel and unexplored regime of \textit{fluid} quantum optomechanics. Building on our previous work with superfluid-Helium filled fiber cavities, which couple an acoustic mode of the Helium to an optical mode of the cavity [2], we report here the first results on photon-phonon counting in such a device using a scheme modified and adapted from [3]. We further report progress toward the conditional preparation and detection of a non-Gaussian single-phonon Fock state of this superfluid resonator. [1] A. D. Kashkanova et. al., Nat. Phys. \textbf{13}, 74 (2017) [2] A. B. Shkarin et. al., arXiv 1709.02794 (2017) [3] R. Riedinger et. al., Nature \textbf{530}, 313 (2016) [Preview Abstract] |
Thursday, May 30, 2019 8:36AM - 8:48AM |
N06.00004: Experimental study of vibrational and optical whispering-gallery modes of levitated superfluid drops. Mehdi Namazi, Charles Brown, Yiqi Wang, Mehmettuna uysal, Glen Harris, Jack Harris Interaction of light with the vibrational motion of various materials provides a powerful tool to study the quantum behavior of microscopic objects. On the other hand, superfluid liquid helium is an unique material with which one can access new regimes of quantum opto-mechanics, due to its extremely low optical and mechanical dissipation, its high thermal conductivity, its ability cool itself via evaporation, and its unconventional degrees of freedom (such as ripplons and vortices). To minimize dissipative coupling to the environment, it is possible to magnetically levitate mm-scale drops of liquid helium in high vacuum. Here we present our latest results on the characterization of vibrational and optical whispering-gallery modes in levitated drops of various size. These preliminary results demonstrate a promising path towards high optical quality factors and strong opto-mechanical couplings in massive objects. [Preview Abstract] |
Thursday, May 30, 2019 8:48AM - 9:00AM |
N06.00005: Trapped Ion Slow Light James Siverns, John Hannegan, Qudsia Quraishi The practical implementation of quantum networks will likely interface different types of quantum systems. Work on photonically-linked quantum systems has typically focused on those with the same photon emission wavelength. Trapped ions and neutral atoms both possess compelling properties as nodes and memories in a quantum network, but have not been photonically linked due to vastly different operating wavelengths. In this talk, I will preset the first interaction between neutral atoms and photons emitted from a single trapped ion [1]. Using slow light in rubidium vapor [2], we delay photons from a trapped barium ion by up to 13.5(5) ns. To overcome the large frequency difference between the two systems, quantum frequency conversion is performed [3]. The delay is tunable and preserves the temporal profile of the photons. This result showcases a hybrid photonic interface usable as a synchronization tool - a critical component in any future large-scale quantum network. [1] J. D. Siverns et al., arXiv:1808.07928 (2018) [2] R. M. Camacho et al., Phys. Rev. A, 73:063812 (2006). [3] J. D. Siverns et al., Phys. Rev. Applied 11, 014044 (2019). [Preview Abstract] |
Thursday, May 30, 2019 9:00AM - 9:12AM |
N06.00006: Remote Hybrid Ion-Rydberg Photonic Quantum Interference John Hannegan, Alexander Craddock, James Siverns, Dalia Ornelas, Andrew Hatchel, J.V. Porto, Steve Rolston, Qudsia Quraishi The interfacing and entangling of disparate quantum systems will likely be necessary to construct practical quantum networks. Two systems of particular interest in quantum networking are trapped ions and neutral Rydberg atoms. A hybrid trapped ion-Rydberg ensemble network achieved through remote photonic interference [1] combines advantages of both systems. Using a trapped ion and Rydberg ensemble, located in separate buildings and connected via optical fiber, we demonstrate Hong-Ou-Mandel interference between photons originating from each system. This interference is shown using both randomly generated photons and those generated on-demand. To overcome the vast spectral disparity between our two sources, we employ quantum frequency conversion of the barium ion photons [2]. This work paves the way for remote ion-Rydberg ensemble entanglement. [1] Duan, L-M., et al., Nature 414.6862 (2001). [2] J. D. Siverns, et al., Phys. Rev. Applied 11, 014044 (2019). [Preview Abstract] |
Thursday, May 30, 2019 9:12AM - 9:24AM |
N06.00007: Probing surface-mediated decoherence with nitrogen vacancy centers Alec Cao, Xue Han, Yuanqi Lyu, Aaron Watson, Shuo Ma, Yi Zeng, Kunal Mukherjee, Ania Jayich, David Weld Surface-mediated decoherence is a central obstacle to the development of quantum technologies. Quantitatively characterizing this decoherence requires attaining control over surface adsorbates coupled to a qubit-like degree of freedom. We have constructed an apparatus that allows reversible in-situ adsorption of indium atoms onto a diamond surface in UHV and direct measurement of adsorbate interactions with shallow subsurface nitrogen vacancy (NV) centers. Measuring NV spin properties at varying adsorbate densities, we observe adsorbate-induced decreases in T1, as well as a reduction in the contrast of Rabi oscillations. Exposure to a nanosecond pulsed laser partially reverses the effects. These results constitute progress toward reversible quantitative control over adsorbate-induced surface decoherence, and motivate the development of a cryogenic UHV “decoherence probe station” with in-situ surface preparation tools, the design of which we will briefly discuss. [Preview Abstract] |
Thursday, May 30, 2019 9:24AM - 9:36AM |
N06.00008: Creating optical cat states entangled with an atom Bastian Hacker, Stephan Welte, Severin Daiss, Lukas Hartung, Lin Li, Gerhard Rempe Schr{\"o}dinger's cat is a famous gedanken experiment on the existence of quantum mechanical superposition states of macroscopic objects [1]. Experimental implementations in quantum optics employ the superposition of two coherent states with opposite phase, so-called cat states. These continuous-variable states have a tunable amplitude to vary the degree of macroscopicity and study decoherence effects. Our experiment implements a strong interaction of a coherent light pulse with a single trapped Rubidium atom, provided by an optical cavity [2]. We deterministically produce a hybrid entangled state between the atomic spin and the phase of the propagating light pulse. A projective measurement of the atomic spin projects the optical state and prepares it in an optical cat state. We study the non-classical properties of the produced states and demonstrate control over all relevant degrees of freedom, using coherent control of the atom. Cat states can be employed for quantum error correction, and may thus find applications in fiber-based optical quantum networks.\\{} [1] E. Schr{\"o}dinger, Naturwissenschaften \textbf{23}, 807 (1935)\\{} [2] B. Hacker et al., Nature Photonics \textbf{13}, 110 (2019) [Preview Abstract] |
Thursday, May 30, 2019 9:36AM - 9:48AM |
N06.00009: Tuning the Order of the Nonequilibrium Quantum Phase Transition in a Hybrid Atom-Optomechanical System Axel Pelster, Niklas Mann, Michael Thorwart A quantum many-body hybrid system is considered formed by a nanomembrane, which interacts optomechanically with light in a pumped cavity, and an ultracold atom gas in the optical lattice of the out-coupled light. An effective atom-membrane coupling can be realized in two different ways: first, the membrane is coupled to the motion of the atoms in the lattice$^1$ and, second, the motion of the membrane is coupled to transitions between two internal atomic states$^2$. By tuning the applied laser intensity, the optomechanical coupling of the membrane motion to the atomic motional or internal states can be tuned and a nonequilibrium quantum phase transition occurs above a critical intensity. Focussing on the latter case, the nonequilibrium quantum phase transition is characterized by a sizeable occupation of the energetically higher internal states and a displaced membrane. In contrast to the motional coupling scheme, its order can be changed by tuning the transition frequency.\\ ~$^1$ N. Mann, M. Reza Bakhtiari, A. Pelster, M. Thorwart, Phys. Rev. Lett. \textbf{120}, 063605 (2018)\\ ~$^2$ N. Mann, A. Pelster, M. Thorwart, submitted (arXiv:1810.12846) [Preview Abstract] |
Thursday, May 30, 2019 9:48AM - 10:00AM |
N06.00010: High-Q Superconducting Mm-wave Cavities for Rydberg Cavity Quantum Electrodynamics Aziza Suleymanzade, Mark Stone, Alexander Anferov, Lin Su, Shiv Agrawal, Jonathan Simon, David Schuster We will outline our progress towards a cryogenic hybrid experimental system for engineering strong interactions between single optical and mm-wave photons using Rydberg atoms as an interface. Bulk 3D cavities in the microwave regime routinely reach quality factors above 10\textasciicircum 7 at single photon powers and even in some case as high as 10\textasciicircum 10. At the same time there has been far less study of resonators at millimeter wave frequencies close to 100GHz. We present experimental results of superconducting fundamental mode niobium cavities at 100GHz, with quality factors exceeding 10\textasciicircum 7 at single photon levels. We will also present experiments showing tuning the cavity frequency in-situ, to be able to exactly match Rydberg transitions. Together with our two-mirror optical cavity, these results bring us closer to manipulating atoms inside of a hybrid mm wave- optical system. [Preview Abstract] |
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