Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W69: Few and Many-Body Quantum OpticsInvited
|
Hide Abstracts |
Sponsoring Units: DAMOP Chair: Ana Asenjo-Garcia, Columbia University Room: Room 421 |
Thursday, March 9, 2023 3:00PM - 3:36PM |
W69.00001: A subwavelength atomic array switched by a single Rydberg atom Invited Speaker: Johannes Zeiher Ordered arrays of emitters with subwavelength spacing have emerged as a novel and versatile platform to realize efficient light-matter interfaces. |
Thursday, March 9, 2023 3:36PM - 4:12PM |
W69.00002: Coherent control of a symmetry-engineered multi-qubit dark state in waveguide quantum electrodynamics Invited Speaker: Gerhard Kirchmaier The coherence properties of an atom or superconducting qubit strongly depend on the electromagnetic environment. Typical circuit QED experiments protect the qubit mode from decay into dissipative modes by placing it into a cavity. Effectively, a reduction of the available mode density reduces the free-space spontaneous emission rate of the qubit. In waveguide QED the qubit is strongly coupled to a continuous mode spectrum, thus it decays rapidly. Collective effects between multiple qubits can be utilized to create subradiant states that decouple from the dissipative waveguide environment. In our experiment we strongly couple two pairs of transmon qubits to the fundamental propagating mode of a rectangular waveguide. We show that the decay of the four-qubit dark state is strongly suppressed, exceeding the waveguide-limited lifetimes of the individual qubits by two orders of magnitude [1]. This four-qubit dark-state can be coherently controlled by utilizing a novel driving scheme relying on the symmetries of the quantum states. The additionally appearing bright state can be used to read out the qubit encoded in the dark state. We characterize the dark state by measuring the coherence time in a Ramsey experiment and perform phase sensitive spectroscopy on the two-excitation manifold which can only be accurately modeled by considering the bosonic nature of the transmons [2]. In the future such a platform can be used to mediate entanglement between remote parts of a superconducting qubit quantum processor and implement quantum information protocols with collective states. |
Thursday, March 9, 2023 4:12PM - 4:48PM |
W69.00003: Superradiant arrays: a novel quantum tool Invited Speaker: Susanne F Yelin Super- and subradiance are examples of cooperative pbenomena. The physics of cooperative atoms/radiators in regular 2D arrays of dipole emitters is dominated by two properties: first, a strongly frequency-selective reflectivity and second, the ability to confine polariton modes cleanly on the surface. This makes such a system highly sensitive to and controllable by light fields. Applications of these systems can be classical or quantum and include beam steering, quantum information processing, metrology, and nonlinear single-photon techniques. I will introduce the basic physics aspect of such a system, explain some of the implementations with atoms and solid materials before introducing some applications. |
Thursday, March 9, 2023 4:48PM - 5:24PM |
W69.00004: Entangled Dark States from Superradiant Dynamics in Multilevel Atoms in a Cavity Invited Speaker: Ana Maria Rey Recent years have witnessed a staggering progress in the control and manipulation of quantum matter for quantum sensing, simulation, and computation. Although so far most of the research has been focused on isolating a pair of internal levels (a qubit) to realize two-level quantum systems, the physics of multilevel atoms is beginning to attract much attention thanks to recent advances in experiments with ultra-cold atoms. In this talk, we will show that in fact systems of multilevel atoms can open untapped opportunities for exploring rich many-body dynamics and creating entangled states of matter useful for quantum technological applications. In particular, we will focus on the collective dissipative decay of multilevel atoms inside cavities, a system that is considerably richer than the case of two-level atoms due to the existence of multiple decay channels and the coupling to two polarization modes of the cavity light. Despite the complexity, we will report it is possible to find regimes where the many-body dynamics can be understood, sometimes even at an analytical level. Interestingly, in contrast to two-level atoms, multilevel atoms can harbour eigenstates that are perfectly dark to cavity decay even within the subspace of permutationally symmetric states. The dark states arise from destructive interference between different internal transitions and are entangled. Furthermore, we will explain how these states can be controlled and manipulated via an external drive and transformed into spin squeezed states that can remain entangled even after the drives are turned off. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700