Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session H06: Quantum Communication and NetworksRecordings Available

Hide Abstracts 
Chair: Sun Shuo, JILA, CU Boulder Room: Salon 1/2 
Wednesday, June 1, 2022 8:00AM  8:12AM 
H06.00001: Excitation Transport in DipoleCoupled Photonic Emitter Arrays Jonah Peter, Stefan Ostermann, Susanne F Yelin In this work, we explore the transport dynamics of ordered and disordered atomic lattices of threelevel Vtype emitters. Understanding the fundamental mechanisms of excitation transport in quantum systems is pivotal for future generation quantum networks and chiral nanophotonics. Additionally, studying such phenomena can provide insight into the functionality of biologicallyinspired lightharversting complexes. While previous studies have demonstrated efficient, unidirectional transport in onedimensional systems via subradiant guided modes or chiral waveguides, here we examine the properties of twodimensional arrays coupled to a nanowire extraction site. We characterize the transport efficiency of circularlypolarized chiral excitons as a function of geometry, detuning, extraction rate, dissipation, and static disorder. 
Wednesday, June 1, 2022 8:12AM  8:24AM 
H06.00002: Demonstration of a compact Franson interferometer for highly nondegenerate timeenergy entangled photons Adam Fallon, Ian Nemitz, Evan Katz, Bertram Floyd, John Lekki We present results from a timeenergy entanglement Bell inequality violation measurement of two highly nondegenerate photons using a compact Franson interferometer. The entangled photons are generated via the spontaneous parametric downconversion of a 532 nm pump photon into timeenergy and polarization degrees of freedom hyperentangled 810 nm and 1550 nm photons. The source is a type II periodically poled potassium titanyl phosphate (KTP) crystal with a fibercoupled input and freespace output. These wavelengths are of particular interest as they lie at the intersection of freespace quantum communication and terrestrial entanglement distribution due to 810 nm undergoing little atmospheric absorption, making it a candidate for satellite to ground quantum links. Furthermore, 1550 nm is capable of directly interfacing with existing telecommunications infrastructure. We report an initial violation of Bell's inequality by more than 3 standard deviations and describe efforts to improve upon this while maintaining stable operation in a low size, weight, and power (SWaP) package. 
Wednesday, June 1, 2022 8:24AM  8:36AM 
H06.00003: Stronglyinteracting photons mediated by Rydberg interactions QiYu Liang Photons usually do not interact with each other. Strong photonphoton interactions have been a longstanding goal in quantum optics, and are crucial to deterministic alloptical quantum logic, singlephoton transistors, as well as exploration of optical manybody phenomena. I will show our experimental demonstration of strong interactions between individual photons, by coupling to stronglyinteracting Rydberg atoms in free space. I will discuss our ongoing efforts to harness these interactions for applications in quantum information processing and quantum networks. Photons propagating through a cloud of ultracold Rb87, under ladderscheme electromagnetically induced transparency, will acquire a nonlinear phase if detuned from the intermediate state. We aim to extend such nonlinear phase for nondestructive detection of optical photons. To get around the fundamental dissipation problem associated with these Rydbergmediated photonphoton interactions, we will explore collective optical responses of subwavelengthspaced atomic arrays, for creation of multiphoton entangled states and highfidelity alloptical devices. 
Wednesday, June 1, 2022 8:36AM  8:48AM 
H06.00004: Photonic chipbased scalable switching of single photons from a trapped ion Uday Saha, James Siverns, John M Hannegan, Mihika Prabhu, Eric A Bersin, Saumil Bandyopadhyay, Jacques Carolan, Qudsia Quraishi, Dirk Englund, Edo Waks Trapped ions are excellent candidates for longdistance quantum networks because of their long qubit coherence times, ability to generate photons entangled with the ion’s qubit states, and highfidelity single and twoqubit gates [1,2]. To establish reconfigurable quantum networks, it is advantageous to route single photons from trapped ions using photonic integrated circuits [3]. However, most trapped ions emit photons in the ultraviolet and visible wavelength regime, making them incompatible with presentday photonic foundries. In this work, we show the ondemand routing of single photons emitted from a trapped barium ion, using a foundryfabricated siliconnitride photonic integrated circuit [4]. We use quantum frequency conversion to generate Cband telecom single photons from barium ions [5], then couple these photons into a silicon nitride waveguide via an edge coupler. We then route the photons into different output ports of a MachZehnder interferometer using an electrical signal. These results will enable a new generation of compact and reconfigurable integrated photonic devices that can serve as efficient quantum interconnects for quantum computers and sensors. 
Wednesday, June 1, 2022 8:48AM  9:00AM 
H06.00005: Progress on Multispecies Ion Trap Quantum Network Node Yao De George Toh, Allison L Carter, Jameson O'Reilly, Sagnik Saha, Isabella M Goetting, Mikhail Shalaev, Christopher R Monroe Trapped atomic ions are one of the leading platforms for quantum computing systems and quantum networks. We plan to utilize a modular architecture consisting of three separate traps, each containing a 171Yb+ memory qubit and a 138Ba+ communication qubit. We will collect single 493 nm photons from the middle node of the network using two invacuo high numerical aperture (NA=0.8) aspheric lenses. These lenses replace the NA=0.6 multicomponent objectives we use to collect single photons from the end node traps. We present preliminary fiber coupling results and heating rate measurements from this system. We also discuss how to generate GHZ states among the three traps using both atomic species. 
Wednesday, June 1, 2022 9:00AM  9:12AM 
H06.00006: Effects of Cavity Birefringence on Polarisation Encoded Remote Entanglement Generation William J Hughes, Ezra Kassa, Shaobo Gao, Joseph F Goodwin The remote entanglement of ions in distinct traps via single photons distributed over a photonic network is a promising method for scaling ion trap quantum computers. Collecting the single network photons using optical cavities can greatly enhance the entanglement rate. 
Wednesday, June 1, 2022 9:12AM  9:24AM 
H06.00007: Multiplexed quantum repeaters based on dualspecies trappedion systems Kaushik P Seshadreesan, Prajit Dhara, Norbert M Linke, Edo Waks, Saikat Guha Trapped ions form an advanced technology platform for quantum information processing with long qubit coherence times, highfidelity quantum logic gates, optically active qubits, and a potential to scale up in size while preserving a high level of connectivity between qubits. These traits make them attractive not only for quantum computing but also for quantum networking. Dedicated, specialpurpose trappedion processors in conjunction with suitable interconnecting hardware can be used to form quantum repeaters that enable highrate quantum communications between distant trappedion quantum computers in a network. In this regard, hybrid traps with two distinct species of ions, where one ion species can generate ionphoton entanglement that is useful for optically interfacing with the network and the other has long memory lifetimes, useful for qubit storage, have been proposed for entanglement distribution. We consider an architecture for a repeater based on such dualspecies trappedion systems. We propose and analyze a repeater protocol based on spatial and temporal mode multiplexing for entanglement distribution across a line network of such repeaters. Our protocol offers enhanced rates compared to rates previously reported for such repeaters. 
Wednesday, June 1, 2022 9:24AM  9:36AM 
H06.00008: Demonstration of Optimal NonProjective Measurement of Binary Coherent States Matt T DiMario, Francisco E Becerra Quantum state discrimination is a central problem in quantum measurement theory, with applications spanning from quantum communication to computation. Quantum mechanics allows for the realization of optimized measurements based on photon counting for the discrimination of nonorthogonal coherent states able to surpass the conventional limits of detection, such as the homodyne and heterodyne limits. Such measurements have a large potential for increasing sensitivities and information transfer in communications and for information processing. In this talk I will describe our current work in the problem of generalized measurements for coherent state discrimination. We implement an optimal inconclusive measurement for binary coherent states [1], a nonprojective measurement that allows for achieving the lowest probability of error for a given rate of inconclusive results. This measurement encompasses standard measurement paradigms for state discrimination, specifically minimum error and unambiguous discrimination, and allows to transition between them in an optimal way. 
Wednesday, June 1, 2022 9:36AM  9:48AM 
H06.00009: Entangling Circularly Polarized Light with the Quantum Zeno Effect Ian C Nodurft, Brian T Kirby, Ryan T Glasser, Harry C Shaw, Thomas A Searles The quantum Zeno effect reveals that a continuously observed quantum system exhibits a natural suppression of its timeevolution. And, as a consequence, the system experiences a measurementdependent restriction of accessible quantum states. Therefore, one should be able to force a group of particles into an entangled state with the quantum Zeno effect. Here, we present a scheme, supported by numerical simulations, where an unentangled photon pair enters each side of a coupled waveguide and evolves into a polarization entangled state. Additionally, we find that the same technique can be used in the generation of Wstates. Our findings present a robust avenue for photonicbased quantum applications without the need for distribution protocols. 
Follow Us 
Engage
Become an APS Member 
My APS
Renew Membership 
Information for 
About APSThe American Physical Society (APS) is a nonprofit membership organization working to advance the knowledge of physics. 
© 2023 American Physical Society
 All rights reserved  Terms of Use
 Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 207403844
(301) 2093200
Editorial Office
1 Research Road, Ridge, NY 119612701
(631) 5914000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 200452001
(202) 6628700