Video Archive

1:03:55
Robust Generation of Photonic Graph States for Quantum Information Processing
November 4, 2021  Chenxu Liu, Virginia Tech
C_{2}QA Quantum Thursdays: Chenxu Liu discusses graph states and how they are useful in quantum computing and information processing.

1:00:03
Xray Vision of Electron Behavior in Quantum Materials
October 27, 2021  Mark Dean
Mark Dean describes a technique, called "resonant inelastic xray scattering," and its uses in studying quantum materials. Dean also discusses progress researchers have made and future opportunities for better understanding quantum materials. Learn more

1:08:28
Engineering Synthetic Materials with Quantum Circuits
October 21, 2021  Christie Chiu, Princeton University
C2QA Quantum Thursdays Christie Chiu shares recent work exploring the kinds of synthetic materials that we can create using quantum circuits, and close by sharing the story of her career path.

1:06:49
Toward Quantum Computation of Quantum Field Theories
October 7, 2021  Yuta Kikuchi, Brookhaven National Lab
C_{2}QA Quantum Thursdays: Classical computations of quantum field theories (QFTs) typically suffer from prohibitively large degrees of freedom that scales exponentially with their system size. Although the Monte Carlo method is a wellestablished approach to circumvent the issue in many cases, realtime evolution of physical systems, quantum chromodynamics (QCD) at finite chemical potential, and so on, are notable examples that the Monte Carlo method fails to simulate. Quantum computing, on the other hand, is expected to be capable of accommodating such a large number of degrees of freedom, as well as, efficiently carrying out computations by exploiting quantum nature of devices such as superposition of states and quantum entanglement.

4:34
The Codesign Center for Quantum Advantage
September 30, 2021
Led by Brookhaven National Laboratory, the Codesign Center for Quantum Advantage (C2QA) is building the fundamental tools necessary to create scalable, distributed, and faulttolerant quantum computer systems.

58:32
Modular Quantum Architectures via Parametric Controls
September 9, 2021  Michael Hatridge, University of Pittsburgh
C_{2}QA Quantum Thursdays: Parametric driving has long been used in weakly nonlinear superconducting circuits to create nearly quantumlimited 'parametric' amplifiers, which are in wide use for the readout of superconducting qubits. However, our and others recent work show that we can extend parametric pumping schemes to create a variety of other vital components of quantum computers, including single and twoqubit gates as well as controlled, coherent links between distant qubits. Michael Hatridge review the basics of parametric control and present our recent realization of a 'quantum signal router' which allows us to create coherent, alltoall links among four superconducting quantum modules, and operate the system as a small modular quantum computer.

1:04:09
Experiments on Superconducting Processors at the Dawn of NISQ era
September 8, 2021  Pedram Roushan, Google
The recent successful computation beyond the capability of classical computers has brought considerable attention to the Noisy Intermediate Scale Quantum (NISQ) processors. The only way to evaluate the promise of NISQ devices is to implement algorithms on them that are of interest to the scientific community. In this talk, Google quantum researcher Pedram Roushan will present two of such examples based on our recent works on time crystals and the Kitaev toric code [1,2].

1:30:15
Building Materials From Microwave Photons
June 9, 2021  David Schuster, The University of Chicago
The study of condensed matter systems in electronic systems within solidstate materials has a long history. More recently, it has become possible to realize synthetic systems out of controllable components in ultracold atom or photonic systems. In this talk, David Schuster discusses how we can use superconducting circuits to make single photons act like strongly interacting hardcore bosons.

1:08:17
Theoretical Reflections on Quantum Supremacy
May 12, 2021  Umesh Vazirani, Univ of California  Berkeley
The recent demonstration of quantum supremacy by Google is a first step towards the era of small to medium scale quantum computers. Dr. Umesh Vazirani explains what the experiment accomplished and the theoretical work it is based on, as well as what it did not accomplish and the many theoretical and practical challenges that remain.

57:26
Dimensionality Reduction of Manybody Problem Using Coupledcluster Formalism
May 6, 2021  Karol Kowalski, Pacific Northwest National Laboratory
C2QA Quantum Thursdays: Novel and predictive modeling tools for overcoming exponential computational barriers in computational chemistry are needed to describe chemical transformations that involve challenging quasidegenerate electronic states. These states are commonly encountered in modeling chemical processes related to catalysis, actinide chemistry, nitrogen fixation, and energy storage materials.

1:00:06
Variational Quantum Algorithms
April 29, 2021  Sophia Economou, Virginia Tech
C2QA Quantum Thursdays: Sohpia Economou discusses variational quantum algorithms (VQAs) and highlights work on the preparation of efficient, problemtailored ansatze for manybody simulation and optimization. VQAs constitute a class of hybrid quantumclassical algorithms that are investigated primarily for NISQ processors.

1:02:57
Correlating Materials Analysis to Eliminate Sources of Noise
April 14, 2021  Nathalie de Leon, Princeton University
Nathalie de Leon describes recent efforts to correlate direct materials characterization with single spin measurements to devise methods to stabilize highly coherent NV centers within nanometers of the surface.

58:27
Superconducting Qubits: Quantum Device Design and Analysis
April 8, 2021  Zlatko K. Minev, IBM
The success of engineering complex quantum phenomena and largescale quantum processors is rooted in our ability to rapidly and reliably design and analyze the underlying quantum devices. We introduce two new methods to this end and an opensource software platform for automated superconducting qubit layout, design, and analysis.

53:57
Practicality of Quantum Random Access Memory
April 1, 2021  Connor Hann, Yale Universtiy
QRAM possesses a remarkable resilience to decoherence, such that a large, reliable QRAM can be constructed from realistically noisy devices. These surprising results indicate that, in some respects, constructing a QRAM is far easier than was previously thought.

42:25
When Photons Get in Line Encoding a Qubit in an Oscillator
March 25, 2021  Baptiste Royer, Yale University
When Photons Get in Line Encoding a Qubit in an Oscillator

59:30
Careers in Quantum Sciences
March 8, 2021  Tina BrowerThomas, Howard University
C2QA Quantum Thursdays Lecture

50:19
Engineering new Solid State Quantum Defects for Quantum Networks
February 25, 2021  Nathalie de Leon, Princeton University
Quantum Lecture Series presented by Nathalie de Leon, 022521

59:37
Teaching Circuits to Act Like Atoms and Photons
February 18, 2021  Robert Schoelkopf, Yale University
Quantum Lecture Series presented by Robert Schoelkopf, 021821

1:03:55
New Methods for Simulating Quantum Dynamics
February 11, 2021  Nathan Wiebe, Pacific Northwest National Laboratory
Quantum Lecture Series presented by Nathan Wiebe, 21121

55:40
An Overview of C2QA
February 4, 2021  Andrew Houck, Princeton University
Quantum Lecture Series. Codesign Center for Quantum Advantage (C2QA) Presented by Andrew Houck, 020421

1:24:01
Chiral Fermions for Quantum Computing
November 4, 2020  Evan Philip
After an introduction to Dirac/Weyl semimetals, I will mention some of their potential applications in quantum computing. I will then present the Chiral Magnetic Photocurrent, our work which contributes to advancing this goal.

50:57
Quantum Long ShortTerm Memory
October 13, 2020  Samuel YenChi Chen
Long shortterm memory (LSTM) is a kind of recurrent neural networks (RNN) for sequence and temporal dependency data modeling and its effectiveness has been extensively established. In this talk, Chen introduces a hybrid quantumclassical model of LSTM, which he dubs QLSTM.

43:43
DrivenDissipative Phase Transition In a Kerr Oscillator
October 6, 2020  Xin Zhang
Xin Zhang reviews open quantum manybody physics using a minimal model, namely a Kerr nonlinear oscillator subject to driving and dissipation. Both numerical and analytical solutions are provided.

38:26
QuantumLimited Squeezed Light Detection With a Camera
September 30, 2020
Elisha Siddiqui presents a technique for squeezed light detection based on direct imaging of the displacedsqueezedvacuum state using a CCD camera.

1:07:10
Quantum Supremacy Using a Programmable Superconducting Processor
December 4, 2019  Pedram Roushan
Dr. Roushan discusses using a processor with programmable superconducting qubits to create quantum states on 53 qubits. The system, Google's Sycamore processor, required about 200 seconds to sample one instance of a quantum circuit a million times, while the equivalent task for a classical supercomputer would take approximately 10,000 years.