Atomic Physics Seminars |
Events During the Week of July 6th through July 13th, 2025
Monday, July 7th, 2025
- No events scheduled
Tuesday, July 8th, 2025
- No events scheduled
Wednesday, July 9th, 2025
- No events scheduled
Thursday, July 10th, 2025
- Microcavity Photonic Interfaces for Neutral Atom Quantum Computing
- Time: 1:00 pm - 2:30 pm
- Place: Chamberlin 5310
- Speaker: Dr. Brandon Grinkemeyer, Harvard University
- Abstract: Neutral atom qubits trapped in optical tweezers are a promising platform for quantum information processing, with control over several hundred qubits already demonstrated. Further scaling could be significantly enhanced by coupling these systems to optical interfaces, enabling quantum networking and fast, non-demolition readout for quantum error correction. In this talk, I will discuss our progress toward developing a photonic interconnect for large-scale neutral atom quantum processors. Specifically, I will present the strong coupling of single atoms to fiber Fabry-Perot cavities and how this interaction can be harnessed for quantum information processing. Additionally, I will introduce novel, scalable fabrication techniques for high-finesse microcavities and ongoing efforts to integrate them with atom arrays.
- Host: Mark Saffman
Friday, July 11th, 2025
- Quantum Sources and Detectors for Quantum Information
- Time: 11:00 am - 12:30 pm
- Place: 5280 Chamberlin Hall
- Speaker: Amr Hossameldin , University of Virginia
- Abstract: Quantum computing offers the potential to solve complex problems beyond the reach of classical systems, with applications in cryptography, optimization, and scientific simulation. Photonic continuous-variable (CV) quantum computing harnesses light’s properties to enable scalable, fault-tolerant quantum computation. In this talk I cover my contributions to this field through developing high performing optical parametric oscillators (OPOs) and photon-number-resolving detectors (PNRDs). These efforts improve the generation and detection of quantum states, providing practical tools for quantum information processing.
I discuss two triply resonant optical parametric oscillators I built: a nondegenerate design which demonstrated 6 dB gain and a degenerate one achieving 24 dB gain—demonstrating strong potential for record quantum squeezing as the squeezing record is 15 dB. These OPOs are sources of two-mode squeezed states, entangled photon pairs, and CV cluster states, supporting measurement-based quantum computing (MBQC) and related applications.
As for PNRDs, I significantly enhanced the photon number resolution of the superconducting transition edge sensor (TES) system in our lab, increasing it from 8 to 37 photons per channel, enabling the resolution of up to 100 photons setting a new record up from the previous record of 16. PNR detectors enable numerous applications, of which I cover a quantum random number generator which I experimentally demonstrated.
Together, the high-gain OPOs and refined TES bolster photonic CV quantum computing, by paving the way for cubic phase gate realization and by extension universal CV quantum computing.
- Host: Josiah Sinclair