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CQRT Seminars

The Atomic, Molecular and Optical (AMO) and Condensed Matter (CM) physics groups are hosting a joint seminar as part of the Center for Quantum Research and Technology (CQRT).  This endowed seminar series brings in experts from across the country as well as across campus to discuss the latest in research advances in quantum science.

Seminars in Spring 2021 will be conducted over Zoom and will be held on Tuesdays from 1:15-2:15pm or Fridays from 12:15-1:15pm, depending upon speaker availability.  If you wish to attend a seminar and are not on our mailing list, please contact either Kieran Mullen (kieran@ou.edu)  or Doerte Blume (Doerte.Blume-1@ou.edu) to obtain a link.

Spring 2021 (virtual Zoom series)

Title: Advanced laser development for uses in fundamental research into the Standard Model, quantum computation, and to the highest powers in industry

Dawn Meekhof, Lockheed Martin Laser and Sensor Systems.

Friday, February 12, 2021
12:15-1:15pm (Zoom link will be announced)

Abstract: Laser technology grew out of advanced pure research, and has proven to be an excellent new tool for many fields. My career has required developing new lasers for fundamental research into the Standard Model, for quantum computation, atomic clocks, advanced telecom products, medical devices, and defense systems. For some of this work, reaching an exact wavelength with 1 mW was necessary, for others building a massive system with 100kW. My career path has taken the laser technology from working to answer the most fundamental of scientific questions to practical applications in industry. In this talk, I will discuss the laser technology, the research, the applications, and how a scientific career in our world can evolve. 

Title: Room temperature polaritonics in all-inorganic cesium lead halide perovskite

Carole Diederichs, Physics Laboratory of the Ecole Normale Supérieure (LPENS), Sorbonne University.

Tuesday, February 16, 2021
1:15-2:15pm (Zoom link will be announced)

Abstract: Strong light-matter coupling in microcavities of various dimensionalities and the resulting hybrid exciton-photon quasiparticles, i.e. the exciton-polaritons, have been reported in a wide range of organic and inorganic semiconductors. While demonstrations of the polariton Bose-Einstein condensation, which is at the heart of promising applications such as polariton lasers, all-optical polaritonic circuits or polariton quantum simulators, are limited within a handful of semiconductors at both low and room temperatures. In inorganic materials, polariton condensation significantly relies on sophisticated epitaxial growth, while organic active media usually suffer from large threshold density and weaker nonlinearities. In this respect, strong efforts have been done in hybrid organic-inorganic perovskite materials, as they combine the advantages of both inorganic and organic materials. However, up to now, polariton condensation has not been observed in such materials. The all-inorganic cesium lead halide perovskites are now part of a class of materials that are drawing attention for polaritonics at room temperature. The epitaxy-free fabrication combined with their excellent optical gain properties, their tunable emission from UV to NIR, and their better optical stability under high laser flux illumination compared with hybrid perovskites, promise further important technological developments. In this seminar, I will present our first results on polariton condensation at room temperature in all-inorganic perovskite microplatelets embedded in planar microcavities, which opened the way to the demonstration of polariton condensates propagation in perovskite microwires and polariton condensation in perovskite lattices that will be also presented. These realizations in epitaxy-free wavelength-tunable materials advocates the great promise of perovskite for polaritonics applications.

Title: Chip-scale electrically-pumped optical frequency combs

Lukasz Sterczewski, JPL

Tuesday, February 23, 2021
1:15-2:15pm (Zoom link will be announced)

Abstract: Chip-scale optical frequency combs (OFC) merge the concept of spectrally broadband emission with coherent laser radiation in a compact footprint. Hundreds to thousands equidistant phase-locked lines synchronized by intracavity nonlinearities have found many applications ranging from telecommunication to optical sensing. To date, however, most developments have been made in the near-IR region at telecom wavelengths. The mid-IR region above 3 µm of wavelength is particularly attractive for optical sensing of hydrocarbons associated with the existence of life. Unfortunately, mid-IR wavelengths still pose a technological challenge and limit the number of available OFC platforms.

One of the efficient ways to generate mid-IR OFCs is to exploit inherent nonlinearities in semiconductor lasers. In this seminar, we will discuss recent progress in interband cascade laser (ICL) OFCs. These sources analogous to that used in the tunable laser spectrometer (TLS) have shown excellent OFC properties with great suitability for free-running dual-comb spectroscopy. The same ICL material has also been used for fabricating GHz-bandwidths room-temperature photodetectors to demonstrate a self-contained room-temperature dual-comb spectrometer. The seminar will also briefly cover mid-IR diode laser OFCs, which have recently extended the portfolio of electrically-pumped OFCs.

Bio: Dr. Lukasz Sterczewski has been a NASA Postdoctoral Program (NPP) research fellow in the Microdevices Laboratory at JPL (389R) since 2019. At MDL, he was responsible for device testing and characterization to optimize the spectral properties of interband cascade laser frequency combs. His doctoral work conducted in the PULSE laboratory at Princeton University, and THz laboratory at Wroclaw University of Science and Technology, Poland, focused on frequency comb spectroscopy in the presence of excessive amounts of noise and unstabilized operation of semiconductor laser sources.

Title:  Atom-based storage and manipulation of electromagnetic signals: a cold-atom quantum memory and a room-temperature atomic radio

Lindsay LeBlanc, University of Alberta.

Friday, March 5, 2021 
12:15-1:15pm (Zoom link will be announced)

Abstract: The ability to store and manipulate quantum information encoded in electromagnetic (often optical) signals represents one of the key tasks for quantum communications and computation schemes. In this talk, I will discuss two platforms our group is using to manipulate electromagnetic signals with atoms:  With a cold-atom system, we have developed and characterized an efficient and broadband quantum memory that operates in a regime that makes use of Autler-Townes splitting (ATS). We demonstrate on-demand storage and retrieval of both high-power and less-than-one-photon optical signals with total efficiencies up to 30%, using the ground state spin-wave as our storage states. We also realize a number of photonic manipulations, including temporal beamsplitting, frequency conversion, and pulse shaping.  In a second, a room-temperature atomic vapour system, we have developed a scheme for radio signal transduction between a microwave and an optical carrier, all mediated through the atoms with the help of a resonant microwave cavity.  We are further exploring this promising atomic-vapour + microwave-cavity platform for applications related to optical quantum memory and quantum sensing.

Title: Commercialising Silicon Quantum Computers

James Palles-Dimmock, Quantum Motion

Friday, March 12, 2021

12.15-1.15pm (Zoom link will be provided)

Abstract: Given that the highest impact applications of quantum computers will need a million plus qubits, how can we get there as quickly as possible? In this talk I will summarise the key hurdles that need to be overcome in order to realise a scalable quantum processor and describe Quantum Motion’s approach. Quantum Motion is developing a quantum processor based on gate defined quantum dot spin qubits in silicon, I will contrast this with other approaches and highlight the particular benefits of our approach and some of our most recent published results.

Title: TBD

Hartwin Peelaers, University of Kansas

Tuesday, March 23, 2021
1:15-2:15pm (Zoom link will be announced)

Abstract: TBD

Title: TBD
Qiang Lin, Electrical and Computer Engineering, University of Rochester

Tuesday, March 30, 2021
1:15pm-2:15pm (Zoom link will be announced)

 

Title: TBD
Ana Asenjo-Garcia, Columbia University 

Friday, April 9, 2021
12:15pm-1:15pm (Zoom link will be announced)

Title:  TBD 

Cherie R. Kagan, University of Pennsylvania

Tuesday, April 13,  2021
1:15-2:15pm (Zoom link will be announced)

Abstract: 

Title: Quantum Astrometry

Andrei Nomerotski, BNL

Friday, April 16, 2021
12:15-1:15pm (Zoom link will be announced)

 

Title: TBD

Charles Brown, UC Berkeley

Tuesday, April 20, 2021
1:15-2:15pm (Zoom link will be announced)

Abstract: TBD

Title: TBD

Alejandro Chávez-Domínguez, OU

Friday, April 30, 2021

12:15-1:15pm (Zoom link will be announced)

Abstract: TBD