The Quantum Network

Our research is articulated along several interwoven tracks, deeply rooted in mathematical foundations and basic science, with an eye for next generation technological applications. The vision is to probe the absolute limits the laws of space physics on information processing and to develop a mathematical theory uniting the use of networks throughout the sciences.

Quantum Noise and Model Reduction Workshop

Sponsored by IARPA and held in Johns Hopkins University’s Applied Physics Laboratory (January 26/27, 2015), “Quantum Noise and Model Reduction Workshop” aims to understand the impacts of realistic noise models on fault-tolerant operation and whether simulation and model reduction tecniques can be used to answer some of these issues.

Purpose of day one (“Abstract noise models for quantum devices”) is to discuss noise processes in superconducting, quantum dot, and ion trap qubits with the goal of identifying a Universal Abstract Representation (UAR).

In day two (“Model reduction tecniques to enable efficient error modeling of quantum circuits”) participants will examine model reduction and error analysis strategies that allow one to go from a low-level, high fidelity physical model of a particular device to a high-level abstract noise model that can be used to efficiently analyze errors in multi-scale quantum circuits.

ISI Research Leader Jacob Biamonte will give a talk and provide a tutorial on tensor network states, presenting an introduction to tensor networks and on how they apply to the issues to be discussed on day two of the workshop.

Quantum Noise and Model Reduction Workshop, Johns Hopkins University’s Applied Physics Laboratory, Laurel (Maryland, US), January 26/27, 2015.

Talk details

Efficient tensor contractions for error model and quantum circuit simulation
Jacob Biamonte
January 27th 2015
slides: APL-tensor-networks-talk.PDF


Tensor networks represent a collection of algorithms and tools which have found increasing use in quantum physics and information science. I’m going to review how nice a few known results look when recast into this fancy framework and I’ll list some of the modern developments that have fuelled the recent interest. These methods admit many new ideas for quantum circuit simulation beyond the existing quantum circuits results on efficient stabilizer, match-gate (etc.) simulation. I’ll tell you about some of the things we’ve shown in this regard, listing key results from the following four papers which resulted from collaborations on this topic.

Tensor Network Contractions for #SAT

with Jason Morton, Jacob Turner
in review,
arXiv:1405.7375 [quant-ph]

Solving search problems by strongly simulating quantum circuits

with Tomi Johnson, Stephen Clark, D. Jaksch
Scientific Reports 3, 1235 (2013)

Undecidability in Tensor Network States

with Jason Morton
Physical Review A Rapid Communications 86, 030301® (2012)

Algebraically contractible topological tensor network states

with S. J. Denny, D. Jaksch, S. R. Clark
J. Phys. A: Math. Theor. 45, 015309 (2012)



Postdoctoral Fellow

Research Group Leader

Senior Research Scientist

Visiting Researchers

Massachusetts Institute of Technology

University of Oxford

Visiting Research Students

Penn State

Institut de Ciències Fotòniques, Barcelona

Recent Alumni

University College London


Vienna Center For Quantum Science and Technology

Support Staff

Scientific Artist

NV Centers Winter School

Workshop on the optimal control of NV center systems
3rd-5th November 2014
ISI Foundation, Via Alassio 11/c, Torino, Italy : Math


Tentative program

Monday 10:30 Introduction to optimal control
11:30 Optimal control algorithms
12:30 Lunch
14:00 Introduction to DYNAMO
15:00 Control Hamiltonians in the RWA
16:00 Exercises
Tuesday 10:30 Introduction to NV experiments
11:30 Simulating NV systems
12:30 Lunch
14:00 Control bounds, transforms, bandwidth
15:00 Different timescales, convergence, avoiding local minima
16:00 Exercises
Wednesday 10:30 TBA
11:30 Beyond the RWA: crosstalk and integrators
12:30 Lunch
14:00 Exercises
15:00 Discussion



Ville Bergholm (ISI Foundation)


Getting to Turin

You can fly either to the Turin-Caselle airport (TRN) or the Milano Malpensa airport (MXP).
TRN is closer and easier, but flights to MXP might be cheaper and more frequent.

From MXP you should take the SADEM shuttle bus to Turin, the journey will take about 2 hours. A one-way ticket is 22 euros.
The MXP bus tickets are sold in the SADEM ticket office in the arrivals hall of the airport.

Likewise, the easiest way to get from TRN to downtown Turin is to take the SADEM shuttle, which will take about 50 mins and cost 7 euros.
You can buy a ticket from the vending machine in the arrivals hall, or from the driver.

Both buses pick up passengers just outside the arrivals hall.

You should get off the bus at the Porta Susa station (if coming from MXP) or the Porta Nuova station (if coming from TRN).
Both are on the metro line (Turin only has one) which also brings you to ISI Foundation, situated near the Spezia metro station.