Abstract: The quantum technology landscape is evolving fast. Quantum networking as one of the three main thrusts in quantum technology has broad use cases. I’ll discuss a few specific technologies in quantum networking, include quantum key distribution, repeater-based quantum networks, and highlight AWS’s work on memory-enhanced quantum repeaters. Finally, I’ll discuss the challenges and opportunities for quantum networks.

Uncovering Local Integrability in Quantum Many-Body Dynamics

Interacting many-body quantum systems and their dynamics, while fundamental to modern science and technology, are formidable to simulate and understand. However, by discovering their symmetries, conservation laws, and integrability one can unravel their intricacies. Here, using up to 124 qubits of a fully programmable quantum computer, we uncover local conservation laws and integrability in one- and two-dimensional periodically-driven spin lattices in a regime previously inaccessible to such detailed analysis. We focus on the paradigmatic example of disorder-induced ergodicity breaking, where we first benchmark the system crossover into a localized regime through anomalies in the one-particle-density-matrix spectrum and other hallmark signatures. We then demonstrate that this regime stems from hidden local integrals of motion by faithfully reconstructing their quantum operators, thus providing a detailed portrait of the system’s integrable dynamics. Our results demonstrate a versatile strategy for extracting hidden dynamical structure from noisy experiments on large-scale quantum computers.

REFERNCE: https://arxiv.org/abs/2307.07552

Due to a scheduling issue, we will not have a QE seminar today.

Engineering levitated optomechanical quantum sensors for applications in nuclear and particle physics

I will describe recent work to optically trap femtogram masses in high vacuum and to cool their motion to the ground state of the trapping potential. The sensitivity of such objects to tiny forces or accelerations is limited by the measurement process itself, and I will describe efforts to surpass the standard quantum limit for simultaneous measurements of their position and momentum in the coming years. Such quantum enhanced metrology has a number of potential applications to precision sensing, including enabling searches for a variety of weakly coupled phenomena in nuclear and particle physics.

Linear combination of Unitaries (LCU) on a quantum computer

Open Q&A about job searches, etc. with Hunter Solomon of Northrop Grumman

No seminar – Career Day

There will be no speaker for today’s seminar series. In lieu of the seminar, we will be hosting a Resume Workshop, which we hope will prepare everyone for the upcoming Career Fair scheduled for next week. This workshop will focus on refining your resume to help you stand out to potential employers for either internships or jobs. To participate, all you need to do is bring a copy of your resume, either printed or on a computer. During the workshop, attendees will have the opportunity to collaborate with peers in partners or small groups. Together, we will review and evaluate each other’s resumes, offering constructive feedback and advice.

Two Approaches to Small Logical Qubits with Planar Superconducting Circuits

In this talk, I discuss two recent, and very different, approaches to engineering protected qubits using continuously driven superconducting circuits. The first, called the star code (arXiv:2302.06707 and 2303.01110), is a refinement of the earlier Very Small Logical Qubit proposal, and is capable of suppressing or correcting all single qubit error processes while only driving linear circuit elements. I will describe the theoretical principles behind the code and report results of a recent experiment by the Schuster lab, demonstrating protection of the codewords. In the second half of the talk, I will discuss a Fluxonium-based error suppression device proposal called the Cold Echo Qubit (arxiv:2212.04588), which can quadratically suppress all single qubit error channels using a single-tone drive structure. I will describe its basic principles and carefully predict expected coherence times using parameters from recent experiments on single fluxonia. Both approaches take advantage of the particular spectral structure of noise in these systems, and both represent compelling paths toward improved quantum computing performance with efficiently packaged 2d geometries.

Summary

Agenda

10/24, Vescent Photonics Workshop, CoorsTek 282, 11:00-12:00 PM

Recorded Talk

https://mines.zoom.us/rec/share/Q94SWTHRnTC3HMOr5z0M3QkRtc_sWnRfpa-Pr2vwxKFVEuEFoJelA5YfIwYiPpIL.oQBCEuM0z_ZHAqWF
Passcode: *90Q+Ar@