Duke University | Pratt School of Engineering


The workshop will open with a reception on Friday evening, and run full days on Saturday and Sunday. Attendees coming from out of the area are encouraged to stay for the full workshop and leave on Monday morning.

Asilomar Conference Grounds map.

All session are in Merrill Hall unless otherwise listed.

Friday 15 May



This pre-workshop tutorial is aimed at participants from the classical networking community, since a productive conversation among all parties requires a shared vocabulary. We will cover the basic concepts of distributed quantum information and entanglement generation, aiming to cover material likely to arise in experimentalists' and theorists' presentations, to allow classical networking experts to understand the implications of the work. Basic mathematical notation (such as kets and density matrices), energy levels of atomic systems and emission of photons, interference and the Hong-Ou-Mandel dip, and the notion of quantum state fidelity and strategies for improving it will be addressed. Students are also welcome to attend. No separate registration is required.


5:00-6:00p, Merrill Hall and Hearthside


6:00-7:00p, Crocker Dining Hall

Saturday 16 May




8:00-8:30a, Hearthside

SESSION 1 - Quantum Repeaters: Objectives, Definitions and Architecture

Discussion Leader: Norbert Lütkenhaus, University of Waterloo
Speakers: Norbert Lütkenhaus; Saikat Guha, BBN Technologies, and others

The goal of this session is to lay the basics. Starting with the original Quantum Repeater work (Briegel et al), we will clarify what the goal of quantum repeaters is. We will give as an example the ability to perform Quantum Key Distribution over large distances. Recently, it has been shown that there is a hard upper bound on the achievable secret key rate, which roughly goes proportional to single photon transmittance for large distances (TGW bound). [Takeoka, Guha, Wilde] One could argue that any scheme breaking the TGW bound can be used as a modern definition of a quantum repeater, which comprises the original quantum repeater, but allows also newer architectures (see afternoon session). For other, non-QKD applications, other bounds might be used as benchmark for quantum repeater properties. Using this view of quantum repeaters, we will discuss what constitutes a quantum repeater, and what does not. (Quantum Relays, QND measurements).



SESSION 2 - Generations of Quantum Repeaters

Discussion Leader:
Thaddeus Ladd, HRL Laboratories, LLC

Overview of Three Generations of Quantum Repeaters Bill Munro
Nippon Telegraph and Telephone Corporation
Quantum Error Correction for Quantum Repeaters Kae Nemoto
National Institute of Informatics
Comparison of Three Generations of Quantum Repeaters Sreraman Muralidharan
Yale University

In this session, we will discuss the role of different forms of error management in quantum repeaters (QRs), and compare three "generations" of QRs under different experimental conditions. Quantum networks over long distances are confronted with two important types of errors: loss errors and operation errors. These can be suppressed using heralded entanglement generation, purification, and deterministic quantum error correction. Depending on how to correct loss and operation errors, QRs have been classed into three generations: (1) The first generation of QRs uses entanglement generation and purification to correct loss and operation errors, respectively. It successfully reduces the overhead in communication rate from exponential to polynomial scaling with distance. (2) The second generation of QRs replaces the entanglement purification with quantum error correction, which further reduces the overhead in communication rate from polynomial to poly-logarithmical scaling with distance. (3) Recently, the third generation of QRs has been proposed, which completely eliminates the two-way communication by using quantum error correction for both loss and operation errors, with communication rate only limited by the speed of local quantum gates. This session will discuss these classes and their resource trade-offs for multiple implementations, and invite discussion as to whether further generations are likely.


12:00-1:00p, Crocker Dining Hall

SESSION 3 - Quantum Repeater Architecture Under Development

Discussion Leaders: Jungsang Kim, Duke University; Wolfgang Tittel, University of Calgary

Challenges and Opportunities for Distributed Quantum Information Processing: Quantum Networking via Memory-Photon Entanglement Jungsang Kim
Duke University
Quantum Repeaters Based on Multiplexed Quantum Memories and External Photon Pair Sources

Wolfgang Tittel
University of Calgary

Mikael Afzelius
University of Geneva

Long-term Quantum Storage: Implications for Quantum Communications Matt Sellers
Australian National University
Two-way Communication Protocols for Distributing Entanglement Cody Jones
HRL Laboratories, LLC

The discussions in this session will focus on concrete experimental approaches currently being pursued by various research communities around the world on quantum repeaters. Almost all of the current experimental efforts are in the very early stages, in many cases inspired by coherent quantum memory systems that interface well with photons used for information transport. We hope to discuss novel features of memoryphoton interfaces at the physical level that enable new and efficient protocols and architectures for quantum repeaters, as well as identify bottlenecks in the performance of the physical systems that must be improved to enable efficient quantum repeater realization.



SESSION 4 - Quantum Networks


Discussion Leader: Rodney Van Meter, Keio University
Panelists: Chip Elliott, BBN Technologies; Joe Fitzsimons, National University of Singapore; Stephanie Barz, University of Oxford; Gabriel Durkin, NASA Ames Research Center

Our ultimate goal is to create networks of quantum repeaters that support one or more applications of interest to potential users. To achieve this goal, we must extend beyond link-level entanglement generation and end-to-end management of entanglement along a path. We must ask how topologically complex networks will behave, and adopt and adapt classical solutions where possible and innovate when necessary. We must also understand what will be required of networks by examining in detail the demands made by applications. This session will address these two major questions.


Optimized coherent quantum feedback network as squeezed-light
source for continuous-variable quantum communication
Constantin Brif
Sandia National Laboratories
Quantum information processing in quantum memories: Advantages and
Animesh Datta
University of Warwick
Semiconductor-based Quantum Communication Networks Cody Jones
HRL Laboratories, LLC
Routing in spin-1/2 quantum networks via quantum control Frank Langbein
Cardiff University
Coherent spin control of nanocavity-enhanced qubit in diamond Luozhou Li
Massachusetts Institute of
Progress towards quantum repeaters using quantum dot spin qubits Peter McMahon
Stanford University
Controlling small ensembles of atoms in cavity Dieter Meschede
University of Bonn
Quantum network exploration with a faulty sense of direction Jaroslaw Miszczak
Institute of Theoretical and
Applied Informatics
Entanglement distillation by dissiation and continuous quantum repeaters Christine Muschik
Institute for Quantum Optics and Quantum Information
Fault tolerant quantum computing in a network Naomi Nickerson
Imperial College
Analysis of quantum network coding for realistic repeater networks Takahiko Satoh
University of Tokyo
Deterministic high-yield creation of nitrogen vacancy centers in diamond photonic crystal cavities and photonic elements Tim Schröder
Massachusetts Institute of
High capacity Fibonacci protocol for quantum communication -
engineering entangled states in high-dimensional Hilbert space
Alexander Sergienko
Boston University
A quantum repeater network based on Rydberg excitations in neutral rubidium ensembles Neal Solmeyer
U.S. Army Research Laboratory
Ultrafast quantum interface between a solid-state spin and a photon Shuo Sun
Institute for Research in
Electronics and Applied
Physics (IREAP), University of
An overview of quantum repeater research at NIST Xiao Tang
National Institute of Standards and Technology
Revealing genuine optical-path entanglement Rob Thew
University of Geneva
Heralded optical quantum states and their storage in optical cavities Jun-ichi Yoshikawa
University of Tokyo
Quantum storage of three-dimensional orbital-angular-momentum
entanglement in a crystal
Zong-Quan Zhou
University of Science and Technology of China


6:00-7:00p, Crocker Dinning Hall

SPECIAL SESSION - US Government Labs and Funding Agencies


POSTER SESSION 2 and Dessert Reception


Gradient echo quantum memory with three-level atoms Ben Buchler
Australian National University
Optimal Control for Quantum Repeater Technologies Tommaso Calarco
University of Ulm
Development of an ensemble-based, triggerable single photon source
with inbuilt quantum memory
Kate Ferguson
Australian National University
Software-defined quantum networking

Travis Humble
Oak Ridge National Laboratory

Temporal multiplexing toward a periodic and deterministic singlephoton
Fumihiro Kaneda
University of Illinois at Urbana-Champaign
Implementation of delayed-choice decoherence suppression using weak Jong-Chan Lee
Pohang University of Science and Technology
Efficient long distance quantum communication Linshu Li
Yale University
Low noise quantum frequency conversion from Rb wavelengths to
telecom O-band
Xiao Li
Joint Quantum Institute, University of Maryland
Tunable solid state quantum memory using rare-earth-ion-doped
Nd3+:GaN crystal
Vladimir Malinovsky
U.S. Army Research Laboratory
Overcoming erasure errors in quantum memories with multilevel systems Sreraman Muralidharan
Yale University
Heterogeneous entanglement swapping Shota Nagayama
Keio University Shonan Fujisawa Campus
Manipulation of frequency-time correlation of narrow-band biphotons
generated from a cold atomic cloud
Kwang-Kyoon Park
Pohang University of Science and Technology
Progress towards quantum state transfer using a micromechanical
resonator cooled to dilution refrigerator temperatures
Robert Peterson
University of Colorado, Boulder
A barium ion trap experiment for remote entanglement and quantum
James Siverns
U.S. Army Research
Characterization of quantum light sources Glenn Solomon
Joint Quantum Institute, University of Maryland
Quantum feedback network under Darboux transformations Agung Trisetyarso
Telkom University
Quantum internetworking Rodney Van Meter
Keio University
Nanophotonic quantum memory based on rare-eath-ion doped crystals Tian Zhong
California Institute of Technology

Sunday 17 May

SESSION 1 - Quantum Repeater Components 1

Discussion Leader: Ping Koy Lam, Australian National University

Quantum Memories Rainer Blatt
Institute for Quantum Optics
and Quantum Information,
University of Innsbruck
Designing Functional Quantum Network Nodes with Neutral Atom Based
Memory, Processing, and Communication
Mark Saffman
University of Wisconsin
TBA Andrew Shields
Continuous Variables Michael Zugenmaier
Niels Bohr Institute
Integrated Quantum Photonics Jeremy O'Brien
University of Bristol



SESSION 2 - Quantum Repeaters Components 2

Discussion Leader: Rob Thew, University of Geneva

Superconducting Single-photon Detectors for Quantum Networking Thomas Gerrits
National Institute of Standards and Technology
Heralded Noiseless Amplification for Quantum Networks Geoff Pryde
Griffith University
Chip-based Quantum Frequency Converters Using Silicon Nanophotonics Kartik Srinivasan
National Institute of Standards and Technology
Quantum Dot Based Quantum Technologies Pascale Senellart
CNRS - Laboratoire de Photonique et de Nanostructures
Efficient and Long-lived Quantum Memory with Cold Atomic Ensembles Xiaohui Bao
University of Science and Technology of China


12:00-1:00p, Crocker Dining Hall

SESSION 3 - Quantum Repeaters Technologies

Discussion Leaders: Tracy Northup, University of Innsbruck; Qudsia Quraishi, U.S. Army Research Laboratory

Progress Towards Quantum State Transfer Using a Micromechanical
Resonator Cooled To Dilution Refrigerator Temperatures
Bob Peterson
University of Colorado,
Coupling Diamond NV Centers To High-Q Dielectric Microcavities Charles Santori
HP Labs
Quantum Memories Based On Rare-earth-doped Crystals Mikael Afzelius
University of Geneva
Towards Scalable Networks Of Solid State Quantum Memories In A
Photonic Integrated Circuit

Dirk Englund
Massachusetts Institute of

Quantum Networks With Spin Qubits In Diamond Andreas Reiserer
Kavli Institute of Nanoscience,
Delft University of Technology

SESSION 4 -  Future Challenges and Open Discussion

Discussion Leader: Thaddeus Ladd

This session is an open, panel-moderated discussion about the future of quantum repeaters and networks. Questions for discussion include: What is needed to advance repeaters and networks as a real technology, both in terms of resources and in terms of gaps in current research efforts? Where are the major gaps, both theoretical and experimental? What are appropriate metrics to evaluate technology readiness for quantum repeaters and networks, and what are reasonable milestones? On what timescale might the community be able to reach those milestones if appropriately supported? What are the appropriate demonstrations to validate repeaters and networks or to assess their relative performance for relevant use cases? How can the community of researchers in this area better collaborate for these purposes?


6:00-8:00p, Seascape Dining Room