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Detailed timetable
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QIS Workshop
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(US/Central)
at Argonne  Bldg 240
at Argonne  Bldg 240
9700 Cass Ave, Lemont, IL 60439
Description 
The purpose of the workshop is to bring together researchers working in two general and overlapping QIS areas, quantum computing/algorithms/simulations and quantum materials/devices/sensing, respectively, with the aim of providing an interactive venue for substantive discussions and to possibly develop/explore collaborations with Argonne scientists. There will be a Workshop Dinner on Monday, September 23rd at Chuck's Southern Comfort Cafe. Chuck's is located at 8025 S. Cass Ave. Darien, IL 60561 
Material:  
Support  Email: stezak@anl.gov 
Go to day


08:30
 09:00
Registration & Continential Breakfast
30'

09:00  10:45
Plenary Session
Location: 1416 
09:00
Welcome
15'
Speaker: Dr. Salman Habib (Argonne National Laboratory) Material: Slides 
09:15
Argonne QIS Overview
45'
Speaker: Stephen Gray (Argonne National Laboratory) Material: Slides 
10:00
Coherent nonlinear photonics: from attojoule to quantum
45'
Looming technical challenges for both general and specialpurpose computation provide strong motivation to revisit device and architecture concepts for alloptical information processing. Communication bottlenecks and power constraints in conventional multicore processor design are driving increasing interest in onchip and chiptochip optical interconnect, while unique features of alloptical approaches make them attractive for edge computing and distributed sensor networks as well. One can already see, however, that demands for high speed and ultralow power consumption are driving us to the picosecondattojoule switching regime in which the quantum nature of optical fields becomes prominent. In this talk I will discuss our group's recent work to develop modeling infrastructure and autonomous coherent feedback control methods for quantum nonlinear photonics. I will illustrate the utility of these tools via circuitdesign case studies for both quantum and ultralow power classical alloptical information processing. I will conclude by discussing emerging challenges in expanding the toolbox to incorporate systematic model reduction and to accommodate broadband signal formats, as motivated by ongoing experiments in quantum nonlinear optics with integrated nanostructures and ultrafast pump fields.
Speaker: Prof. Hideo Mabuchi (Stanford University) Material: Slides

09:00
Welcome
15'
 10:45  11:05 Break

11:05  12:15
Parallel Track A  Theory
Location: 1404/1405 
11:05
Hybrid Quantum/Classical Algorithms for Photochemistry
20'
We present some recent developments in hybrid quantum/classical methodology for firstprinciples photochemistry simulations of large multichromophoric complexes. The first key tool utilized is an ab initio exciton model (AIEM) that uses onthefly ab initio computations on chromophore monomers to parametrize a FrenkelDavydovtype exciton model that is mappable to a Paulisparse qubit Hamiltonian with one or more qubits per monomer. The second key tool involved is the "multistate, contracted variational quantum eigensolver" (MCVQE), a new extension of VQE that enables the evenhanded quantum circuit treatment of ground, excited, and transitionproperty observables. MCVQE+AIEM shows promise for the accurate treatment of absorption spectra and other photochemical observables for systems with several thousand atoms using only a few dozen qubits and relatively short quantum circuits. We numerically demonstrate the potential accuracy of the method for the classicallysimulated MCVQE+AIEM computation of the absorption spectrum of the B850 ring of LHII, discuss the extension of the method to the efficient computation of the analytical nuclear gradient (needed for dynamics simulations), and the consider prospects for deployment of the method on nearterm quantum circuit hardware.
Speaker: Dr. Robert Parrish (QC Ware Corporation) 
11:30
Robustness of persistent oscillations in kinematically constrained qubit systems
20'
Recent quantum simulators have found unexpected coherent and persistent oscillations in an ergodic system at infinite temperature. This behavior has been theoretically understood by studying kinematically constrained spin models that lead to special lowentangled states that are embedded in a thermalizing spectrum. We study the robustness of the dynamics generated by these special states against the presence of disorder and external drives. To do this, we evaluate diagnostic quantities such as the revival probability, the spatial entanglement, and the average spin dynamics. The goal of this study is to capture features that could be explored more generally in other types of quantum simulators such as coupled superconducting qubits.
Speaker: Dr. Ian Mondragon (Argonne National Laboratory) Material: Slides 
11:55
Crystalline Cluster States for Topological MeasurementBased Quantum Computing
20'
Although there are promising nearterm applications for NISQ algorithms, quantum computing’s most impactful algorithms will likely require a fully faulttolerant quantum computer. Given the fragility of quantum information, building this computer is a daunting task. Most proposals for faulttolerance are based on quantum errorcorrecting codes, in which the information is preserved in code qubits while ancilla are periodically measured to check for errors. Recently, a more general framework for faulttolerance in oneway quantum computers was proposed in which logical information is passed among all of the qubits, without any distinction between data and ancilla. In this talk, we discuss an algebraic framework for building these generalized faulttolerant oneway quantum computers based on combinatorial tiling theory. This yields a variety of robust candidates, including some that require only degree$3$ connectivity.
Speaker: Dr. Michael Newman (Duke University) Material: Slides

11:05
Hybrid Quantum/Classical Algorithms for Photochemistry
20'

11:05  12:15
Parallel Track B  Experiment

11:05
QIS activities at IU Bloomington
20'
Indiana University in Bloomington has recently established a center for Quantum Science and Engineering, involving researchers from Physics, Computer Science, Intelligent Systems Engineering and Chemistry. I will provide an overview of some of the activities of the center over the last year.
Speaker: Prof. Baxter David (Indiana University) Material: Slides 
11:30
Spins in InAs quantum dots: qubits, sensors, and photon sources
20'
InAs quantum dots (QDs) are known for their strong optical transitions that lead to a nearly ideal source of single photons. Additional functionality comes from charging the QD with a single electron or hole spin that acts as a stationary quantum bit. In this presentation, I will discuss how a spin in a QD or in a pair of coupled QDs can be used for sensing mechanical motion and for generating tunable single photons. To sense motion, QDs have been incorporated into mechanical resonators, which couple to the dots through strain. When mechanical resonators are driven, the optical transitions of QDs shift significantly, and the spin states shift as well [1]. In single QDs, the hole spin shows much stronger coupling to strain than electrons spins, due to the stronger spinorbit interaction. In coupled QDs, a pair of interacting electron spins can be made highly sensitive to strain gradients that change the relative QD energies [2]. To generate photons, we make use of the Raman spinflip process, often enhancing the process by integrating the QDs into photonic crystal cavities [3]. The Raman process has the advantage of generating photons with properties determined by the drive laser and the spin properties. In this way, we are able to demonstrate spectral and temporal control over single photon wavepackets [4], with very low two photon emission probability and high indistinguishability. Finally, I will briefly discuss efforts that combine these topics, in which highly localized strain is used to tune multiple QD photon emitters into resonance within nanophotonic waveguides [5]. This work is supported by the U.S. Office of Naval Research, the Defense Threat Reduction Agency (grant no. HDTRA1 1510011) and the OSD Quantum Sciences and Engineering Program. [1] Carter, S. G. et al. Spinmechanical coupling of an InAs quantum dot embedded in a mechanical resonator. Phys. Rev. Lett. **121**, 246801 (2018). [2] Carter, S. G. et al. Tunable coupling of a double quantum dot spin system to a mechanical resonator. Nano Lett. **19**, 6166–6172 (2019). [3] Sweeney, T. M. et al. Cavitystimulated Raman emission from a single quantum dot spin. Nat. Photonics **8**, 442–447 (2014). [4] Pursley, B. C., Carter, S. G., Yakes, M. K., Bracker, A. S. & Gammon, D. Picosecond pulse shaping of single photons using quantum dots. Nat. Commun. **9**, 115 (2018). [5] Grim, J. Q. et al. Scalable in operando strain tuning in nanophotonic waveguides enabling three quantumdot superradiance. Nat. Mater. **18**, 963–969 (2019).
Speaker: Dr. Samuel Carter (US Naval Research Laboratory) Material: Slides 
11:55
Quantum simulation and computing with atomic arrays
20'
The realization of largescale controlled quantum systems is an exciting frontier in modern physical science. Such systems can provide insights into fundamental properties of quantum matter, enable the realization of exotic quantum phases, and ultimately offer a platform for quantum information processing that could surpass any classical approach. Recently, reconfigurable arrays of neutral atoms with programmable Rydberg interactions have become promising systems to study such quantum manybody phenomena, due to their isolation from the environment, and high degree of control. I will show how these techniques can be used to study quantum phase transitions by realizing quantum spin models with system sizes up to 51 qubits. Furthermore, I will discuss the prospect for quantum information processing with arrays of atoms and present our recent results on the creation of a 20 qubit GHZ entangled state. Prospects for scaling this approach beyond hundreds of qubits and the implementation of quantum algorithms will be discussed.
Speaker: Prof. Hannes Bernien (University of Chicago) Material: Slides

11:05
QIS activities at IU Bloomington
20'
 12:15  12:30 Break to pickup lunch

12:30
 13:30
Working Lunch / Breakout Session
1h0' (
1416
)
Quantum Transduction Quantum Photonics

12:30
 13:30
Working Lunch / Breakout Session
1h0' (
14041405
)
Quantum Networks NISQ/Quantum Computing Issues

13:30  15:00
Plenary Session
Location: 1416 
13:30
“Quantum Supremacy” and the Complexity of Random Circuit Sampling
45'
Speaker: Bill Fefferman (University of Chicago) Material: Slides 
14:15
Controlling light with a single photon using semiconductor quantum dots
45'
Speaker: Edo Waks (University of Maryland)

13:30
“Quantum Supremacy” and the Complexity of Random Circuit Sampling
45'
 15:00  15:20 Break

15:20  16:10
Parallel Track B  Experiment

15:20
TiO2 nanophotonic cavities for highefficiency coupling to quantum states in diamond
20'
In this talk, we will discuss our development of nanophotonic resonators utilizing templated atomic layer deposition and ongoing efforts to interface these cavities with vacancy centers in diamond membranes. Vacancy centers in diamond, such as the nitrogen vacancy (NV) or silicon vacancy (SiV), exhibit outstanding quantum coherence combined with a straightforward optical interface. Advanced QIS applications with vacancy centers require integration with nanophotonics to achieve efficient photon/qubit interactions. Stateoftheart approaches utilize reactiveion etching to etch photonic crystals directly into diamond, which creates charge traps, surface roughness, and dangling chemical bonds that degrade coherence. Here, we will show how we can utilize templated atomic layer deposition to grow titanium dioxide nanophotonics directly onto arbitrary surfaces, including oxides, 2D materials, and diamond. The process requires no destructive etching and should be fully passive to the underlying substrate, opening a new path to coherent interfaces with vacancy centers. We will also discuss our ongoing efforts to make diamond membranes.
Speaker: Prof. Alex High (University of Chicago) Material: Slides 
15:45
Quantum metrology for detection of classical dark matter waves
20'
Various techniques will be presented to improve detection of the Glauber displacement of a photon mode due to the weak classical force exerted by oscillating background dark matter waves.
Speaker: Aaron Chou (Fermilab) Material: Slides

15:20
TiO2 nanophotonic cavities for highefficiency coupling to quantum states in diamond
20'

15:20  16:10
Parallel Track A  Theory

15:20
Hybrid QuantumClassical Computing Architectures
20'
This talk explains how classical supercomputing can aid unreliable quantum processors of intermediate size to solve large problem instances reliably. I will describe the benefits of using a hybrid quantumclassical architecture where larger quantum circuits are broken into smaller subcircuits that are evaluated separately, either using a quantum processor or a quantum simulator running on a classical supercomputer. Circuit compilation techniques that determine which qubits are simulated classically will greatly impact the system performance as well as provide a tradeoff between circuit reliability and runtime.
Speaker: Martin Suchara (Argonne National Laboratory) Material: Slides 
15:45
Principal component analysis in static and dynamical quantum problems
20'
Principal component analysis (PCA) is a popular Machine Learning algorithm used for dimensional reduction. We show that PCA is naturally suited for the extraction (and subsequent utilization) of quantum information in problems involving state ensembles. We illustrate its representational power in the context of quantum manybody ground state manifolds, and discuss an application in predicting the quantum dynamics of driven systems.
Speaker: Dr. Zhoushen Huang (Argonne)

15:20
Hybrid QuantumClassical Computing Architectures
20'

16:10
 16:30
Day 1 WrapUp
20'
 16:45  18:30 Reception/Poster Session ( 1416 )
 18:30  21:30 Dinner ( Chuck's Southern Comfort Cafe )

08:30
 09:00
Registration & Continential Breakfast
30'


08:30
 09:00
Registration & Continental Breakfast
30'

09:00  10:35
Plenary Session

09:00
Welcome
5'
Speaker: Dr. Salman Habib (Argonne National Laboratory) 
09:05
Emerging Semiconductor Single Photon Counters and Quantum Photonic Integrated Circuits
45'
Speaker: Seth Bank (University of Texas at Austin) 
09:50
Progress in Quantum Computing with Trapped Ions
45'
Speaker: Jungsang Kim (Duke University) Material: Slides

09:00
Welcome
5'
 10:35  11:00 Break

11:00  12:10
Plenary Session

11:00
Learning Quantum Algorithms for NISQ Computers
20'
Speaker: Lukasz Cincio (Los Alamos National Laboratory) 
11:25
Title TBD
20'
Speaker: Prof. David Schuster (U.Chicago) 
11:50
Quantum Computing at Scale
20'
Speaker: Dr. Yuri Alexeev (Argonne National Laboratory) Material: Slides

11:00
Learning Quantum Algorithms for NISQ Computers
20'
 12:10  12:25 Break to pickup lunch

12:25
 13:30
Working Lunch / Breakout Session
1h5'
• Quantum Chemistry • Metrology

12:25
 13:30
Working Lunch / Breakout Session
1h5'
Quantum Defects Quantum Algorithms

13:30  15:35
Plenary Session

13:30
Trappedion experiments at NIST
45'
Speaker: Dr. David Hume (NIST) 
14:15
Variational QuantumClassical Algorithms: New Applications and Noise Resilience
45'
Speaker: Patrick Coles (Los Alamos National Laboratory) 
15:00
Day 2 Wrapup
15'
Speaker: Dr. Salman Habib (Argonne National Laboratory)

13:30
Trappedion experiments at NIST
45'

08:30
 09:00
Registration & Continental Breakfast
30'