Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E10: Quantum/Coherent Control: Cold Gases and Quantum InformationLive
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Chair: Colin Parker, Georgia Tech |
Tuesday, June 1, 2021 2:00PM - 2:12PM Live |
E10.00001: Coherent control of an all-atomic waveguide: trap and release of an excitation Ricardo Gutierrez-Jauregui The last few years have seen a renewed interest in collective radiation of atomic ensembles. This trend is driven by advances in trapping techniques for individual atoms that allow for atoms to be trapped one by one until a desired pattern is created [1]. For ordered atomic arrays, the interference between photons scattered by each atom leads to correlated states and a strong collective response that, among other properties, can be used to enhance the light-matter coupling strength in free space [2] or allow for lossless transport of excitations [3,4]. Here, we propose to control the collective response of all-atomic waveguide using a far-detuned external field. This spatially-varying dressing field correlates internal (spin) and external (position) degrees of freedom. Each atom then reacts differently to the field scattered by its neighbors and endows the chain with exotic collective behavior such as non reciprocal transport. We present a new scheme to trap an excitation traveling along the chain before releasing it or reflecting it back in a controlled fashion. |
Tuesday, June 1, 2021 2:12PM - 2:24PM Live |
E10.00002: Experiments on a Quantum Matter Synthesizer Jonathan Trisnadi, Mingjiamei Zhang, Lucas Baralt, Connor Fieweger, Lauren Weiss, Cheng Chin The "Quantum Matter Synthesizer" is a new experimental apparatus capable of single-site atom imaging and re-arrangement through the use of dual high numerical aperture microscopes and moveable tweezer arrays. Cold cesium atoms are first stochastically loaded into an 2D triangular lattice Subsequently, degenerate Raman sideband cooling is applied to the atoms and their fluorescence is collected on a low-noise CCD to image the atomic distribution in the lattice. A re-arrangement algorithm computes tweezer trajectories to bring the atoms to a desired configuration. The computed moves are then streamed to a digital micromirror device, which is capable of moving an array of tweezers at the switching speed of 2 kHz. After re-arrangement, the atoms are again cooled and their final distribution imaged. We will report our progress toward the completion of the system. |
Tuesday, June 1, 2021 2:24PM - 2:36PM Live |
E10.00003: Manipulating anyons in quantum Hall droplets of light using dissipations Yangqian Yan, Qi Zhou Whereas anyons are the building blocks in topological quantum computation, it remains challenging to create and control each anyon individually. Here, we point out that dissipative dynamics in cavities deterministically deliver droplets of light in desired fractional quantum Hall states. In these quantum Hall droplets, both the number and locations of anyons are precisely controllable without requiring extra potentials to imprint and localize such quasiparticles. Using the density profile of light, the anyonic statistics is readily accessible. Moreover, preparing a coherent mixuture of a single-quasihole state and a two-quasihole state establishes a direct readout of the braiding statistics. Our work unfolds a promising route for quantum optics to solve challenging problems in quantum Hall physics. |
Tuesday, June 1, 2021 2:36PM - 2:48PM Live |
E10.00004: Operational entanglement of symmetry-protected topological edge states Kyle Monkman We use an entanglement measure that respects the superselection of particle number to study the nonlocal properties of symmetry-protected topological edge states. Considering half-filled M-leg Su-Schrieffer-Heeger ladders as an example, we show that the topological properties and the operational entanglement extractable from the boundaries are intimately connected. Topological phases with at least two filled edge states have the potential to realize genuine, nonbipartite, many-body entanglement that can be transferred to a quantum register. The entanglement is extractable when the filled edge states are sufficiently localized on the lattice sites controlled by the users. We show, furthermore, that the onset of entanglement between the edges can be inferred from local particle number spectroscopy alone and present an experimental protocol to study the breaking of Bell's inequality. |
Tuesday, June 1, 2021 2:48PM - 3:00PM Live |
E10.00005: Speeding up particle slowing using shortcuts to adiabaticity Jarrod Reilly, John Bartolotta, Murray J Holland We propose a method for slowing particles by laser fields that potentially has the ability to generate large forces without the associated momentum diffusion that results from the random directions of spontaneously scattered photons. In this method, time-resolved laser pulses with periodically modified detunings address an ultranarrow electronic transition to reduce the particle momentum through repeated absorption and stimulated emission cycles. We implement a shortcut to adiabaticity approach that is based on Lewis-Riesenfeld invariant theory. This affords our scheme the advantages of adiabatic transfer, where there can be an intrinsic insensitivity to the precise strength and detuning characteristics of the applied field, with the advantages of rapid transfer that are necessary for obtaining a short slowing distance. For typical parameters of a thermal oven source that generates a particle beam with a central velocity on the order of meters per second, this could result in slowing the particles to near stationary in less than a millimeter. We compare the slowing scheme to widely implemented slowing techniques that rely on radiation pressure forces and show the advantages that potentially arise when the excited-state decay rate is small. Thus, this scheme is a particularly promising candidate to slow narrow-linewidth systems that lack closed cycling transitions, such as occurs in certain molecules. |
Tuesday, June 1, 2021 3:00PM - 3:12PM Live |
E10.00006: Limits to atomic qubit control from laser noise Matthew L Day, Pei Jiang Low, Brendan White, Rajibul Islam, Crystal Senko The use of laser radiation for high fidelity manipulation of atomic qubits presents a pathway to large-scale universal quantum computation. Technical noise from the laser source itself can erroneously couple to qubit rotations and therefore must be minimized to reach the highest fidelities. The ultimate fidelity floor for atomic qubits driven with laser radiation is due to spontaneous emission from excited energy levels. This work addresses the requirements to suppress control noise from the laser source to below the spontaneous emission floor such that it is no longer a limiting factor. It has previously been found for microwave sources that the spectral structure of the noise plays a critical role [1]. By considering the spectral structure of laser frequency noise, we find that, contrary to common belief, narrowing the laser linewidth alone is not sufficient for high fidelity qubit control. From these considerations we find that laser gain media with long relaxation times have an advantage in relaxing requirements on stabilisation bandwidths. For laser intensity noise, we find that errors from shot-noise limited light are always below the spontaneous emission floor, and we present requirements for the active stabilisation of laser noise to the shot noise limit. The requirements have wider implications for the generation of microwave local oscillators for both atomic and superconducting qubit control. |
Tuesday, June 1, 2021 3:12PM - 3:24PM Live |
E10.00007: Holonomic Quantum Computing in Ultracold Neutral Atoms via Floquet Engineering Logan W Cooke, Arina Tashchilina, Joseph Lindon, Tian Ooi, Benjamin D Smith, Taras Hrushevskyi, Lindsay J LeBlanc Holonomic quantum computing (QC) aims to be an intrinsically fault-tolerant alternative to conventional QC techniques; it utilizes geometric phases in highly degenerate systems to realize universal unitary transformations of states in the manifold. While there have been many successful implementations, a scalable platform remains elusive in large part because of the required degeneracy. Recently, several proposals have identified Floquet engineered systems of ultracold atoms as a potential candidate, where fast periodic driving results in the required degeneracies between atomic spin states and their subsequent holonomic evolution. With this promising outlook for holonomic QC in ultracold atomic systems, a full understanding requires us to consider the effects of interactions in these protocols. Here we present some recent theoretical and experimental progress towards implementing the Floquet-engineered holonomic QC scheme in a rubidium-87 BEC including the effects of mean-field interactions. |
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