Research on Joe Wiedemann

PXS Microwave Electronics

Sun, 15 Feb 2026 00:00:00 +0000

PXS Electronics Work

As we develop new state-of-the-art amplifier technology for sub-GHz bands, we have needed to develop supporting infrastructure for the auxillary components that make up the rest of our read out chain. Two of the standout infrastructure pieces has been designing room-temperature analog circuitry that controls a cryogenic multi-pole switch, and designing superconducting lumped-element diplexers. This work is complimentary to the effort to develop high quality coaxial cable - see more on that work in PXS Coax Development.

PXS Cryogenic Coax Development

Tue, 20 Jan 2026 00:00:00 +0000

Coaxial Cable and PXS Readout

High-quality cryogenic coaxial cable is critical to sensitive microwave experiments. While the expanding market in support of quantum computing has introduced numerous commericial solutions for bulk and/or high-density cable, these offerings remain expensive and require a priori knowledge of the system design. By developing laboratory methods to fabricate our own cable I was able to reduce lead times and cost, achieve greater freedom in our RF system design, and provide bespoke-level focus that has resulted in leading systematic performance.

PXS Software Development

Mon, 10 Mar 2025 00:00:00 +0000

PXS Software needs

Because the Princeton Axion Search is a new lab at the university, we have had to develop the infrastruture that enables the scientific research. We strongly value flexibility and control, so we opt for open source or homebrew solutions whenever possible. Particularly in the context of a research lab, designing systems that work across various operating systems, integrate with numerous decades of technology, and can are maintainable has proven to be an excellent opportunity to learn about system design.

PXS Cryogenics

Wed, 10 Apr 2024 00:00:00 +0000

PXS Cryogenic Requirements

The haloscope axion experiment model requires superconducting magnet technology, as well as quantum-limited readout. We have had the fortunate ability to develop the sub-systems independently. Each system has unique demands to work cryogenically. The magnet requires hundreds of amps to be delivered at 4 Kelvin, all while being cooled exlcusively through conduction mechanisms. For the readout development, we have had to design and commision a custom cryostat with a base temperature of 270 milli-Kelvin, as well as integrate testing equipment into a Dilution Refrigerator for device testing that requires the 10 milli-Kelvin base temperature.

Rydberg Atom Dark Evolution Sensing (RADES)

Sat, 01 Jan 2022 00:00:00 +0000

Project Summary

This research project focused on developing novel experimental techniques for Rydberg atom electrometry, specifically implementing time-separated field procedures to establish new sensitivity standards. The work utilized Rydberg atom dark evolution sensing (RADES) to achieve unprecedented electric field sensitivity.

Research Objectives

The primary goal was to develop and demonstrate improved electric field sensitivity standards using Rydberg atoms, with applications in quantum metrology and precision measurements.

Key Achievements

Achieved 10nV/cm/√Hz sensitivity at 10GHz using Rydberg atom dark evolution sensing
Developed time-separated field procedures for improved measurement precision
Established new sensitivity standards for Rydberg atom electrometry

Methodology

The research involved:

Superradiance of Few Driven Two-Level Quantum Dot Emitters in the Bad Cavity Limit

Mon, 10 May 2021 00:00:00 +0000

Project Summary

Senior thesis work in extracting coupling parameters for demonstrated superradiance from strain-tuned quantum dots in a Naval Research Labs experiment. For this work, the entire simulation was written in MATLAB for Hilbert spaces that represent distinguishable emitters and represented by total angular momentum. Computations were ran primarily locally.

Objectives

The simulation work focused on:

Creating a first-principles models to re-create experimental results from NRL collaborators
Writing a master equation suite to develop simulation of a quantum system connected to an adiabatic bath
Developed wrappers to scale coupling operators to arbitrary hilbert space
Evaluated Superradiant behavior based on second-order photon correlation
Developed mechanisms to evaluate effects of coherent and incoherent driving fields

Featured plots

Ultimately the master-equation model was able to match the experimental data taken by the Naval Research Lab using only 4 free parameters.

Scintillation of Laser Beams carrying OAM

Mon, 10 Feb 2020 00:00:00 +0000

Project Summary

This research project investigated whether imparting Orbital Angular Momentum (OAM) onto Gaussian mode laser beams improves their intensity stability when propagating through atmospheric turbulence. The work was conducted in a near-maritime environment, requiring the construction of a long-range optical link.

Research Objectives

The primary goal was to determine if OAM-carrying beams exhibit improved resistance to scintillation effects compared to standard Gaussian beams when propagating through turbulent atmospheric conditions.