Tunneling spectroscopy paper on arXiv!

https://arxiv.org/abs/2411.07997

Tunneling Spectroscopy in Superconducting Circuit Lattices
Botao Du, Qihao Guo, Santiago López, Ruichao Ma

We demonstrate tunneling spectroscopy of synthetic quantum matter in superconducting circuit lattices. We measure site-resolved excitation spectra by coupling the lattice to engineered driven-dissipative particle baths that serve as local tunneling probes. Using incoherent particle source and drain, we independently extract quasi-particle and quasi-hole spectra and reconstruct the spatial structure of collective excitations. We perform spectroscopy of a strongly interacting Bose-Hubbard lattice at different densities, observing changes in energy gaps across the superfluid to Mott-insulator transition and the effects of three-body interactions. Our results provide a new toolset for characterizing many-body states in analog quantum simulators.

Group attends MCAW 2024

The group travels to the Midwest Cold Atom Workshop 2024, University of Michigan, Ann Arbor, and celebrates Wendy’s birthday!

AFOSR-funded DEPSCoR grant

Alex receives an AFOSR-funded DEPSCoR grant with collaborator and mentor Prof Qi Zhou.

The project is titled “Tailoring Quantum Entanglement in Driven-Dissipative Superconducting Circuits”. This project will develop novel methods to design and create entangled quantum states in superconducting circuits, to enable advanced quantum technologies for computing, emulation and sensing applications.

News Coverage: https://www.purdue.edu/research/features/stories/purdue-gets-depscor-grants-worth-2-4-million-from-defense-department/

Quantum Open House 2023

Alex co-organized the Purdue Quantum Open House 2023, and gave the opening public lecture. Our lab ran lab tours and participated in running the various activities.

This year, over 120 participants from local communities participated in talks, research lab tours, and hands-on demo activities, all focused on introducing Quantum Science and Technology. 60 student volunteers ran the activities (nearly 40 grad students and over 20 undergrads), along with 10+ faculty members / research groups from Physics and Astronomy, Electrical & Computer Engineering, and Chemistry departments.

New Coverage: https://tinyurl.com/PurdueQOH2023
To follow past and future QOH events: https://www.physics.purdue.edu/outreach/quantum_openhouse.html

Kevin receives Rolf Scharenberg Graduate Fellowship

Kevin Barrow receives the Rolf Scharenberg Graduate Fellowship for this summer, congrats!

The Rolf Scharenberg Graduate Fellowship was established in 2017 through the generosity of Wendell and Nancy Lutz.  The fellowships allow first- or second-year graduate students to work with a research advisor for a summer prior to joining a research group permanently. https://www.physics.purdue.edu/about/prizes_awards/graduate_awards.html#Rolffellow

Alex and Ramya lead outreach activity at Birck Nano Expo 2023

Alex and Ramya led an outreach activity at the Birck Nano Expo, where high school students learned about quantum computing and explored superconducting levitation in the quantum activity room.

Fifty Lafayette Jefferson High School students attended Birck Nanotechnology Center’s Nano Expo 2023 on Friday (April 14). The Nano Expo is an immersive, hands-on experience where high school students can discover how nanotechnology is used and learn about the many career opportunities in the field available in Indiana.

https://www.purdue.edu/newsroom/archive/purduetoday/releases/2023/Q2/birck-expo-teaches-high-school-students-about-nanotechnology.html

Ma Lab at March Meeting 2022

DoE funded Quantum Science Center

The Ma lab is now part of the Quantum Science Center led by Oak Ridge National Lab, one of the five quantum centers recently funded by DoE. As part of this effort, our lab will be developing superconducting circuits and qubit-based sensors for probing quantum materials, materials defects, and excitations. This is a highly collaborative effort and we are looking for motivated, hardworking postdoc and students to join the team.

Lab Updates - Aug 2020

  • Our lab renovation will be finished soon, finally:)

  • We received our Bluefors dilution fridge back in March, although the installation has been postponed due to the covid pandemic. We are now waiting to move into the new lab first, and then attempt to install the fridge ourselves with remote assistance from Bluefors, FUN!

  • We also recently received our new e-beam evaporator from Plassys dedicated to our superconducting Josephson junction fabrication. The Plassys evaporator will be housed in the cleanroom at Purdue’s Birck Nanotechnology Center. We will try installing the system with the help of our Birck engineers and remote assistance from Plassys. Doubly FUN…

  • Our team has been mostly working from home since March. We have implemented a detailed Covid SOP for returning to research labs. We are now slowly ramping up our experimental efforts, following university and CDC guidelines. Fingers crossed for a safe and productive fall semester for everyone!

Our new lab in G041

Bluefors dilution refrigerator, to be installed in our new lab

Our Plassys evaporator for Josephson junction fabrication, housed in Purdue’s Birck Nanofabrication Center.

Part of our COVID PPE stock :)