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 M07: Novel Applications of Quantum Optics SystemsRecordings Available

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Chair: Johannes Schachenmayer, CNRS, Institut de science et d'ingénierie supramoléculaires Room: Salon 5/6 
Wednesday, June 1, 2022 2:00PM  2:12PM 
M07.00001: Buildyourown optical cycling transitions Eliza Cornell, Benjamin Pingault, Neil Sinclair, Marko Loncar To probe the spin states of opticallyactive quantum emitters, researchers often use cycling transitions whereby an optical field couples a target ground state to an excited state that primarily decays back to the same ground state. In this way, if the emitter is in the target ground state, it can be excited multiple times, resulting in multiple opportunities to measure its state. This method has led to highfidelity singleshot readout of spins in diamond color centers, including nitrogen vacancy and silicon vacancy centers. Certain physical systems, however, do not contain such cycling transitions. For example, when the magnetic field applied to the silicon vacancy center is misaligned from the defect’s axis (a requirement for coupling phonons to its spin), the cyclicity of its optical transitions is greatly suppressed. When the system is optically excited under these conditions, it may decay to an undesired ground state, dramatically reducing the fidelity of the optical readout. Here, we evaluate the possibility of an induced cycling transition, caused by the creation of coherence in the excited state manifold and designed such that undesired decay channels are suppressed. 
Wednesday, June 1, 2022 2:12PM  2:24PM 
M07.00002: Sensing applications of impurities embedded in a twodimensional array of quantum emitters Stefan Ostermann, Susanne F Yelin The collective modes of a twodimensional array of dipoledipole coupled quantum emitters can mediate interactions between distant impurities embedded in the array. In the case of two impurities this results in highly efficient excitation transfer between impurities. We show that the efficiency of this population transfer is very sensitive on the relative detuning between the impurities' transition frequencies. We highlight applications of this effect for cooperatively enhanced quantum sensing and analyze how the overall sensitivity depends on fundamental system parameters. We also elaborate on how the enhanced sensing can be associated with the appearance of exceptional points in the spectrum of the nonHermitian Hamiltonian governing the system's dynamics. 
Wednesday, June 1, 2022 2:24PM  2:36PM 
M07.00003: Inverting and canceling normal and anomalous group velocity dispersion using spacetime wave packets Layton A Hall, Ayman F Abouraddy Chromatic dispersion is an intrinsic property of optical materials that broadens and deforms optical pulses. Well known methodologies may compensate (precompensate) for dispersion after (before) propagation through the medium, typically by exploiting angular dispersion. Dispersion cancellation, on the other hand refers to modifying the field structure so that it propagates invariantly in a dispersive medium. In this context, a fundamental theorem indicates that angular dispersion can cancel normal groupvelocity dispersion (GVD) but not anomalous GVD. We show that socalled nondifferentiable angular dispersion unique to a class of pulsed beams dubbed spacetime wave packets helps overcome this limitation and helps cancel normal or anomalous GVD symmetrically. We demonstrate this capability experimentally by synthesizing spacetime wave packets that are dispersive in free space but become dispersionfree once coupled to the appropriate medium whether in the normal or anomalousGVD regime – all while maintaining independent control over the group velocity of the wave packet. 
Wednesday, June 1, 2022 2:36PM  2:48PM 
M07.00004: A dual color, frequency and pulse duration agile laser system for particle spectroscopy and manipulation via chirped optical lattices Alexandros Gerakis We report on the development and performance characteristics of a novel laser system, capable of delivering two pulses of arbitrary temporal shape and duration (range 51000 ns) in both the fundamental and frequency doubled frequencies of Nd. More importantly, this laser system is capable of achieving linear relative frequency excursions of up to 10 Ghz between the two laser arms, during the duration of the pulse. These output characteristics are achievable from the nJ stage up to the 500 mJ/pulse output of each arm, while we are currently upgrading the system to reach 2.5J/pulse/arm. We demonstrate the use of the chirped optical lattices delivered by this laser system for performing singleshot atomic and molecular gas translational spectroscopy and flow velocimetry with dual color coherent RayleighBrillouin scattering, while discussing its potential use in different types of spectroscopy. Finally, it is envisioned that the chirped optical output delivered by this system can find applications in experimental techniques requiring the use of chirped optical lattices, such as e.g. optical Stark deceleration/acceleration. 
Wednesday, June 1, 2022 2:48PM  3:00PM 
M07.00005: Imaging from quantum noise without a camera Savannah Cuozzo, Charris Gabaldon, Ziqi Niu, Pratik Barge, Hwang Lee, Lior Cohen, Irina B Novikova, Eugeniy Mikhailov In lowlight imaging, the accuracy of detection is often limited by the dark noise of a camera. Quadraturenoise shadow imaging (QSI) can allow this issue to be partially circumvented by analyzing the quantum noise of the illuminating probe beam with nonclassical noise statistics (e.g., quadrature squeezed vacuum). Direct implementation of QSI puts stringent requirements on the camera used, making it more expensive and more restrictive (e.g., with a single noise quadrature detected at a time). On the other hand, classical singlepixel imaging methods have been developed to reconstruct the object shape without a camera by exposing it to different spatial patterns. Here we present a method combining the analysis of quantum noise modes and singlepixel imaging techniques to reconstruct an image in the low light regime without relying on a camera. This method also allows us to track the phase changes with each mode, providing more complete spatial information about the object of interest. 
Wednesday, June 1, 2022 3:00PM  3:12PM 
M07.00006: Stimulated Raman Scattering in KXe Kavita Desai, Andrey Mironov, J. Gary Eden Stimulated Raman scattering has been observed in the transient molecule KXe through the optical excitation of ground state KXe pairs. In the wavelength range of 769.6770.6 nm, stimulated emission with a linewidth of 2 cm^{1} on the B^{2}Σ^{+}_{1/2}→X^{2}Σ^{+}_{1/2} transition of the molecule has also been observed despite the dissociative nature of the B^{2}Σ^{+}_{1/2 }state . Additional wavelengths can also be generated through stimulated emission by detuning the pump wavelength as much as 25 cm^{1} from the resonance line, a phenomenom not observed previously in other alkali rare gas systems. 
Wednesday, June 1, 2022 3:12PM  3:24PM 
M07.00007: The Quantum Enhanced Tracker for Charged Particles Nicolas C DeStefano, Saeed Pegahan, Irina B Novikova, Eugeniy E Mikhailov, Seth Aubin, Todd D Averett, Jiahui Li, Shukui Zhang, Alexandre Camsonne, Gunn Park The optical quantum enhanced tracker is a tabletop prototype detector of charged particles with high resolution in three dimensions. The electrons, passing through a volume filled with rubidium atoms, modify atomic quantum states and cause local changes in atoms' optical properties. We can identify the magnetic signature of passing electrons by means of nonlinear magnetooptical polarization rotation near the rubidium D_{2} optical transition. By illuminating the interaction volume from two sides, we show preliminary detection of lowenergy electrons in two dimensions, revealing electron beam characteristics such as beam diameter and position. The fullscale version of the current apparatus may be implemented in the future at Jefferson National Laboratory for detecting tracks of relativistic charged particles. 
Wednesday, June 1, 2022 3:24PM  3:36PM 
M07.00008: Adding Doublons to a Photonic FloquetTopological Insulator Helena Drueeke, Dieter Bauer Topological photonics with laserinscribed waveguides in glass is a way to implement a large class of timedependent hopping Hamiltonians and to solve the corresponding timedependent Schrödinger equation [1]. We characterize a Floquettopological insulator on a finite square lattice [2] with an additional onsite potential along the diagonal. In addition to the usual bulk and edge states, this system also exhibits doublon states along the diagonal. The doublons' energies increase with the diagonal potential, which leads to crossings and avoided crossings with other states. 
Wednesday, June 1, 2022 3:36PM  3:48PM 
M07.00009: Selfsustained harmonic oscillators in the quantum regime A. J Sudler, J. Talukdar, Doerte Blume Selfsustained harmonic oscillators play an important role in the selforganization of dynamical classical systems. Recent work [1] clarified the classicaltoquantum correspondence for three different types of oscillators, namely the Raleigh oscillator, the van der Pol oscillator, and the Raleighvan der Pol oscillator. In the classical regime, these oscillators are characterized by nonlinearities that are proportional to the square of the velocity, proportional to the square of the position, and proportional to the kinetic energy, respectively. Using a master equationbased formulation, this contribution will present results for the quantum dynamics of selfsustained oscillators. Comparisons with classical trajectory calculations will also be presented. [1] L.B. Arosh, M.C. Cross, and R. Lifshitz, Physical Review Research 3, 013130 (2021). 
Wednesday, June 1, 2022 3:48PM  4:00PM 
M07.00010: Nested spheres description of the Chern number and multilevel state tomography Nur Unal, Cameron Kemp, Nigel R Cooper The geometric interpretation of spin 1/2 systems on the Bloch sphere has been widely appreciated in physics research. While similar notions for larger Hilbert spaces exist in mathematics, they have been less explored for practical usage in condensed matter settings. We here characterize a general Nlevel system by its coherence vector on the higher dimensional generalized Bloch (hyper)sphere, where topological properties take simple forms set by the SU(N) algebra. We present a geometric interpretation for the Nlevel Chern number in terms of a nested structure comprising N1 twospheres. We prove the existance of an exterior twosphere that provides a useful characterization by playing a primary role in determining the Chern number, which demonstrates an effective twolevel description and can be directly measured in ultracold atoms via band mapping techniques. By investigating the time evolution directly on the Bloch hypersphere, we develop a tomography scheme involving quenches to extract the full state vector of threelevel systems in experiments. Our geometric description opens up a new avenue for the interpretation of the topological classification and the dynamical illustration of multilevel systems, which in turn helps in the design of new experimental probes. 
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