Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session LL03: V: Progress in AMO Physics IVirtual Only

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Sponsoring Units: DAMOP Chair: Rimsha Shaikh, NED University of Engineering and Technology Room: Virtual Room 03 
Wednesday, March 6, 2024 4:00PM  4:12PM 
LL03.00001: Towards a Realistic Model for CavityEnhanced Atomic Frequency Comb Quantum Memories: The Critical Role of Dispersion Shahrzad Taherizadegan, Jacob Davidson, Sourabh Kumar, Daniel Oblak, Christoph Simon Future quantum networks rely on longdistance quantum communication which is limited due to the unavoidable photon transmission loss in optical fibers. Quantum repeaters (QRs) are promising quantum alternatives to play the role of classical amplifiers. Atomic frequency comb (AFC) quantum memory implemented in rareearthion doped crystals is a favorable protocol in longdistance quantum communication based on quantum repeaters. Putting the AFC inside an asymmetric optical cavity enhances the storage efficiency but makes the measurement of the comb properties challenging. We develop a theoretical model for cavityenhanced AFC quantum memory and investigate the role of dispersion in the model. We demonstrate that including the effect of dispersion leads to a good agreement between experimental and model results, whereas the model without dispersion falls short strikingly. Most importantly, the model with dispersion provides a much closer quantitative agreement for estimating the efficiency and a drastically better description of how the efficiency changes as a function of detuning. Furthermore, it better captures certain qualitative features of the experimental reflectivity. Our model is a step forward to accurately estimating the created comb properties, such as the optical depth inside the cavity, and so to being able to make precise predictions of the performance of the prepared cavityenhanced AFC quantum memory. 
Wednesday, March 6, 2024 4:12PM  4:24PM 
LL03.00002: Superentanglement: Unification of Quantum and Classical Physics Syed Zaheer We postulated based on widely accepted principles, reinterpreted mathematical equations, and worked from a bottomup approach, rather than a topdown approach in an attempt to gain a greater understanding of various universal phenomenon. Accordingly, in order to solve for the anomalies presented by quantum physics, we applied these reinterpreted postulates to collapse of the wave function and quantum entanglement using models based on Euclidian geometry. We further applied this premise and determined entanglement leads to gravity, time, mass, velocity, particle spin, as well as the subatomic and atomic structure, confirming our hypothesis the universe is simultaneously local and nonlocal. 
Wednesday, March 6, 2024 4:24PM  4:36PM 
LL03.00003: Carbon dioxide (CO_{2}) as a quantum molecular sensor in protoplanetary disks.Statetostate rovibrational transition rates for CO_{2} in the bend mode in collisions with helium (He) atoms. Taha Selim, Gerrit C Groenenboom, Ad van der Avoird Modeling environments that are not in local thermal equilibrium, such as protoplanetary disks or planetary atmospheres, with molecular spectroscopic data requires knowledge of the rates of rovibrationally inelastic molecular collisions. Here, we present rate coefficients for temperatures up to 500 K for CO_{2}He collisions in which CO_{2} is (de)excited in the bend mode. They are obtained from numerically exact coupledchannel (CC) calculations as well as from calculations with the less demanding coupledstates approximation (CSA) and the vibrational closecoupling rotational infiniteorder sudden (VCCIOS) method. All of the calculations are based on a new accurate ab initio fourdimensional CO_{2}He potential surface including the CO_{2} bend mode. We find that the rovibrationally inelastic collision cross sections and rate coefficients from the CSA and VCCIOS calculations agree mostly to within 50% with the CC results at the rotational statetostate level and to within 20% for the overall vibrational quenching rates except for temperatures below 50 K where resonances provide a substantial contribution. Our CC quenching rates agree with the most recent experimental data within the error bars. We also compared our results with data from Clary et al. calculated in the 1980's with the CSA and VCCIOS methods and a simple atomatom model potential based on ab initio HartreeFock calculations and found that their cross sections agree fairly well with ours for collision energies above 500 cm^{1}, but that the inclusion of long range attractive dispersion interactions is crucial to obtain reliable cross sections at lower energies and rate coefficients at lower temperatures. 
Wednesday, March 6, 2024 4:36PM  4:48PM 
LL03.00004: Cooperative nonMarkovian emission in a singleband waveguide Alfonso Lanuza, Dominik Schneble We investigate the collective radiative dynamics of two quantum emitters emitting two bosons in a 1D singleband waveguide. While this problem is normally solved approximately, with the Markovian approximation being the most extended, we solve the system exactly and analytically. This opens up the possibility of exploring, without relying on numerical methods, different topics such as the connection between superradiance and synchronization, the formation of multiemittermultiexcitation bound states (states akin to a molecule of light), or decayinduced entanglement. 
Wednesday, March 6, 2024 4:48PM  5:00PM 
LL03.00005: A Diffusion Quantum Monte Carlo Approach to the Polaritonic Ground State Braden M Weight, Sergei Tretiak, Yu Zhang Constucting and using polaritonic states (i.e., hybrid electronphoton states) for chemical applications have recently become one of the most prominent and active fields that connects the communities of chemistry and quantum optics. Modeling of such polaritonic phenomena using ab initio approaches calls for new methodologies, leading to the reinvention of many commonly used electronic structure methods, such as HartreeFock, density functional, and coupled cluster theories. In this work, we explore the formally exact diffusion quantum Monte Carlo approach (DQMC) to obtain numerical solutions to the polaritonic ground state during the dissociation of the H_{2} molecular system. We examine various electronnuclearphoton properties throughout the dissociation, such as changes to the minimum of the cavity BornOppenheimer surface, the localization of the electronic wavefunction, and the average mode occupation. Finally, we directly compare our results to that obtained with stateoftheart, yet approximate, polaritonic coupled cluster approaches. 
Wednesday, March 6, 2024 5:00PM  5:12PM 
LL03.00006: Subnanometer confinement and phononic bus in multidimensional atomic lattice Mohammadsadegh Khazali Optical lattices are the basic blocks of atomic quantum technology. The scale and resolution of these lattices are diffractionlimited to the light wavelength. Tight confinement of single sites in conventional lattices requires excessive laser intensity which in turn suppresses the coherence due to enhanced scattering. This talk proposes a new scheme for atomic optical lattice with subwavelength spatial structure. The atom light interaction coupling combined with Rydberg interaction has opened a wide range of applications in quantum technology [110]. This presentation utilises the nonlinear optical response of the threelevel Rydbergdressed atoms to form ultranarrow trapping potentials [11]. This arrangement is not constrained by the diffraction limit of the driving fields. The lattice consists of a 3D array of ultranarrow Lorentzian wells with subnanometer widths. These extreme scales are now optically accessible by a hybrid scheme deploying the dipolar interaction and optical twist of atomic eigenstates. The interactioninduced twobody resonance that forms the trapping potential [12], only occurs at a peculiar laser intensity, localizing the trap sites to ultranarrow regions over the standingwave drivin. The tight confinement is desired for quantum logic operations with RydbergFermi interaction [1314], and distance selective operations [15]. Finally, the interaction induced trapping forms collective motional modes among lattice sites generating phononic bus in three dimensional lattice.

Wednesday, March 6, 2024 5:12PM  5:24PM 
LL03.00007: Optimal population transfer in drivendissipative systems using adiabatic rapid passage Nilanjana Chanda, Pratik Patnaik, Rangeet Bhattacharyya Adiabatic rapid passage (ARP) is extensively used to achieve efficient transfer of population between two levels of atomic systems. Landau and Zener accurately derived the transfer probability of ARP for closed systems following unitary dynamics and showed that this probability increases with higher drive amplitude. In this work, we adopt a quantum master equation approach to investigate the dissipative effects of the applied drive on the performance of ARP that is implemented using a linearlychirped pulse on a twolevel system interacting with its environment. From the LandauZener formula, the population transfer was known to be enhanced with increasing drive amplitude. However, we show that beyond a threshold value of the drive amplitude, the transfer probability is reduced because of the detrimental effect of the driveinduced dissipation. We report that the interplay between the two processes results in an optimal population transfer. Furthermore, we propose a phenomenological model that qualitatively explains the observed nonmonotonic behavior of the transfer. Using this model, we also estimate the optimum time at which the maximum population transfer occurs. We perform the analysis for rectangular as well as Gaussian pulse profiles and conclude that the use of a Gaussian pulse leads to more efficient transfer. 
Wednesday, March 6, 2024 5:24PM  5:36PM 
LL03.00008: Improved selection of dark states in the presence of driveinduced dissipation. Arpan Chatterjee, Rangeet Bhattacharyya We revisit the coherent population trapping (CPT) of a threestate system in the 
Wednesday, March 6, 2024 5:36PM  5:48PM 
LL03.00009: Squeezing in atomic boson sampling William D Shannon, Vitaly V Kocharovsky Recently, atomic boson sampling of excited atom occupations in an equilibrium interacting gas with a 
Wednesday, March 6, 2024 5:48PM  6:00PM 
LL03.00010: Optically levitated single droplet study of the sea spray aerosol that contains the mercuric halides YUKAI AI, Chuji Wang, Gorden Videen, Yongle Pan Mercury exists in the atmosphere in three major forms: gaseous elemental mercury, gaseous oxidized mercury, and particulatebound mercury. Among these three forms, the gaseousphase mercury takes up more than 90% and has been well studied. However, the particulatebound mercury that is mainly related to the heterogeneous surface, such as aerosols, airwater interfaces, etc., has been less investigated. This is mainly due to the complex nature of heterogeneous chemistry and the experimental difficulties in making accurate measurements. 
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