Events

November 15 @ 1pm MST in CoorsTek 370, Dr. Dr. Jim Phillips, Application Scientist at Zurich Instruments USA

HOW TO USE A LOCK-IN AMPLIFIER TO IMPROVE YOUR PRECISION MEASUREMENTS

Dr. Jim Phillips, Application Scientist
Zürich Instruments USA
1:00 PM, Tuesday 15 Nov., in CoorsTek 370

Abstract: Electronic signals for precision measurements are extremely small. For periodic signals, lock-in amplifiers improve sensitivity by orders of magnitude. In this presentation, you will learn about the principles and characteristics of lock-in amplifiers and about applying them to condensed matter and quantum experiments.

Bio: Jim Phillips enjoyed a long career in research into precision astronomical instruments and tests of gravity, developing a laser distance gauge accurate for 1 m distances to the diameter of a uranium nucleus. He joined Zurich Instruments in 2018 and is having fun solving problems for customers.

November 3 @ 10-11am MST in Marquez Hall 126, Dr. Daniel Slichter, a staff scientist in the Ion Storage Group at NIST Boulder

LASER-FREE ENTANGLEMENT AND SQUEEZING WITH TRAPPED IONS

Abstract: Trapped atomic ions in vacuum are a leading platform for quantum computing, sensing, and networking, thanks in part to their excellent coherence properties and the ability to manipulate and measure their quantum states with high fidelity. While quantum state manipulation in trapped ions typically relies on high-performance laser systems, our group is working to demonstrate high-fidelity control of trapped ions with rf/microwave magnetic and electric fields and gradients, with the goal of improving both performance and scalability. I will describe some recent results, including microwave/rf-based generation of entangled Bell states of ion spin with fidelity on par with that of the best laser-based demonstrations, and the use of laser-free trap potential modulation to perform strong unitary squeezing of ion motion, enabling sensing of electric fields below the standard quantum limit and enhancement of motion-mediated ion-ion entangling interactions. I will conclude by providing some perspectives on how laser-free control may offer advantages for large-scale trapped ion quantum computing.

Bio: Daniel Slichter is a staff physicist at in the Ion Storage Group at NIST in Boulder, CO.  His research focuses on quantum information experiments with trapped atomic ions, with an emphasis on developing new paradigms for scalable trapped ion quantum computing and networking. Recent projects include performing high-fidelity entangling operations with microwave and rf fields instead of lasers; using strong unitary squeezing of ion motion to enhance ion-ion interactions and to perform electric field sensing below the standard quantum limit; and integrating superconducting photon detectors into microfabricated ion traps as an initial step in building a fully chip-integrated trapped ion quantum processor. Prior to NIST, he conducted research in superconducting quantum information, where he performed the first continuous high-fidelity measurement of a superconducting qubit, studied quantum feedback and measurement backaction, and worked on the development of near-quantum-limited microwave-frequency superconducting parametric amplifiers.

October 12 @ 1:30-2:30PM MST on Zoom, Dr. Kevin Satzinger at Google Quantum AI

Dr. Kevin Satzinger is a research scientist at Google who works on their superconducting quantum computers, and will give a talk about both Google’s quantum computer effort in general, and their recent surface code error correction experiment. The seminar is over Zoom from 1:30-2:30 pm MST this coming Wednesday, link below. He will also stick around for half an hour afterward for Q&A with students and faculty. Anyone interested in quantum in the Mines community is welcome!

Description:ekapit@mines.edu is inviting you to a scheduled Zoom meeting. Join from PC, Mac, Linux, iOS or Android: https://mines.zoom.us/j/98405016821?pwd=K1hXejd3Q09VRUFKUlBPVy85bVVxQT09 Password: 807110 Or iPhone one-tap: 17193594580,98405016821# or 16699006833,98405016821# Or Telephone: Dial: +1 719 359 4580 (US Toll) or +1 669 900 6833 (US Toll) Meeting ID: 984 0501 6821 International numbers available: https://mines.zoom.us/u/aems6ItZSq Or a H.323/SIP room system: H.323: 162.255.37.11 (US West) or 162.255.36.11 (US East) Meeting ID: 984 0501 6821 Password: 807110 SIP: 98405016821@zoomcrc.com Password: 807110

September 26 @ 11AM in CK282, Special QE Seminar: Engineering Parametric Interactions Between Superconducting Circuits

RAYMOND SIMMONDS
NIST

Abstract: Over 15 years ago, parametric coupling was proposed as a way to entangle flux qubits at their “sweet spots” with frequencies that were far detuned from each other. This was a possible solution to the difficulty with optimizing the spectrum of flux qubits that were extremely sensitivity to the variations in the critical current of their smallest fabricated Josephson junctions. After one major demonstration, this strategy was soon abandoned. In contrast, ion trap systems have always relied on parametric interactions that are naturally more flexible, allowing all-to-all tunable coupling between individual qubits. Over a decade ago, our group at NIST (in Boulder, CO) revived the parametric coupling strategy as a powerful tool for engineering interactions between superconducting circuits. In this talk, I will explain our parametric ideology and highlight our group’s continued efforts to develop non-resonant, parametrically induced coupled interactions between transmon-based qubits and cavities to enable fast, high fidelity gate operations and measurements. Finally, I’ll discuss improving, connecting, and expanding these systems for constructing analog quantum simulators or processing quantum information.