Medium posts by Alba Cervera-Lierta

QUANTIC team member Alba Cervera-Lierta has begun a series of pedagogical posts about quantum technologies on the Medium channel of the Quantum World Association.

In the first post titled ‘Quantum Computation: playing the quantum symphony’, Alba gave a nice introduction to qubits and the existing market of quantum technologies. At the end of the post, a beautiful figure classifies all existing businesses around quantum technologies. Such a figure already had a lot of attention by the media and the community.

New review article by Dr. Forn-Díaz

A new article has been completed by QUANTIC group member Pol Forn-Díaz. The review titled ‘Ultrastrong coupling regimes of light-matter interaction’ is a compilation of the evolution of this area in quantum optics exploring the boundaries of the field. Dr. Forn-Díaz has been a pioneer with his PhD as well as postdoctoral work with superconducting qubits coupled to resonators and open systems. The review includes an overview of the history of the Rabi model since its inception, and includes progress in other relevant experimental areas such as polaritons in semiconducting microcavities and other hybrid systems such as molecules in cavities and magnons in microwave resonators.

This work is a collaboration with members of the UPV Bilbao group from Enrique Solano, Lucas Lamata and Enrique Rico, as well as Prof. Jun Kono from the Rice University at Houston, in Texas.

The article has been posted on the arxiv repository with reference 1804.09275.

Figure from the review containing a summary of the main results in different areas with maximum coupling strength normalized to the cavity mode.

Official presentation of MIT-La Caixa Seed Fund project

Dr. Pol Forn-Díaz from the QUANTIC team participated in the press release of the MIT-La Caixa Seed Fund project at the beautiful Palau Macaya in Barcelona. The project titled ‘Multi-Qubit Couplings in Superconducting Quantum Circuits’ involved a collaboration with Prof. W. D. Oliver at MIT.

The event was led by Àngel Font (La Caixa), Mercè Balcells (MIT, IQS and one of the instigators of this seed fund), and awardees Josep Samitier (director of IBEC) and Alexandra Muñoz Bonilla (IMDEA). The fund has awarded a total of 12 projects out of the 30 which were evaluated. BSC obtained two awarded projects. See the BSC press release for more information.

The news was picked up by the media. You can read the news on the official La Caixa foundation site (in Spanish/Catalan), newspapers Ara (Catalan), La Vanguardia (Spanish), El País (Spanish), El Mundo (Spanish).

New Master Student!

The QUANTIC team is growing! Katarzyna Kowalska just joined us to carry out her Master thesis. Katarzyna will join the theory team but will also carry out some lab work. Katarzyna has a background in Math and has had ample experience on artificial intelligence. She is currently conducting a Master of Advanced Math and Mathematical Engineering at the Polytechnical University of Catalonia (UPC). Welcome Katarzyna!

Andrés Rosario Hamann visits QUANTIC group

Last week we had the visit of Andrés Rosario Hamann, from the SQD group led by Prof. Arkady Fedorov at the University of Queensland at Brisbane (Australia).

Andrés visited BSC and Mare Nostrum (see pic) and also ICN2, where Dr. Forn-Díaz is setting up the laboratory of Prof. Valenzuela. Andrés presented his work on a quantum diode built out of two superconducting qubits in a waveguide.

Thanks for visiting us Andrés!

 

Workshop Quantum Simulation and Computation in Bilbao

Last month we witnessed one of the most important events in the Quantum Simulation and Computation scene in the world this year. The workshop in Bilbao contained a set of the leading scientists in the world in all areas of quantum information, particularly experimental quantum computation and simulation.

Besides, a couple round tables made the event even more special. A first round table moderated by Enrique Solano and Gavin Brennen with scientists discussed the future of quantum computation, the challenges and the visions from top players in the field such as Rainer Blatt (Innbruck), Michel Devoret (Yale), Alan Aspuru-Guzik (Harvard), Jens Eisert (Freie Universität Berlin), Christine Muschik (IQC Waterloo), Frank Wilhelm (Universität des Saarland). A second round table with representatives from the corporate world was moderated by Víctor Canivell, president of the Quantum World Association, and included Sergio Boixo (Google), Will Zheng (Rigetti), José Ignacio Latorre (Qilimanjaro), Arman Zaribafiyan (1QBit), Toni Juan (Metempsy).

The QUANTIC team was represented twofold. First, Artur García-Sáez presented preliminary results on a new type of quantum algorithm known as ‘Adiabatically Assisted Variational Quantum Eigensolver’ (AAVQE) which is currently being written up. The second participation was from José Ignacio Latorre who participated at the industrial round table and explained his views from the position of a scientist trying to raise private funds.

The event was co-organized by Enrique Rico (Bilbao), Juan José García-Ripoll (IFF-CSIC, Madrid) and Pol Forn-Díaz (QUANTIC).

New publications by QUANTIC team

Last month was busy, we will be updating the news section with more posts soon.

Some of the most important news relate to publications. The QUANTIC team has added a new preprint of a theory paper on Multipartite entanglement on the publications section titled ‘Multipartite entanglement in spin chains and the Hyperdeterminant‘. The work led by Alba Cervera-Lierta from QUANTIC team studied classes of entangled states and a measure for their ‘entanglement-ness’, called hyperdeterminant. It turns out you need four qutrits to yield maximally entangled states.

In addition, one of the papers under review by Dr. Forn-Díaz has been accepted to the prestigious journal Nature Communications. The work entitled ‘Probing the strongly driven spin-boson model in a superconducting quantum circuit‘ is a combined theory and experiment study of the well-known spin-boson model, taken in a new domain of parameters. Using a superconducting flux qubit coupled to a transmission line, combined with a strong drive on the qubit, led to a dressed state picture in the strongly dissipative regime, which had not been studied yet. The result is important in the area of analog simulation of condensed-matter models using superconducting circuits.

Qubit spectral traces as function of applied strong drive amplitude (y-axis). The splitting is a signature of the strong dissipative regime of the spin-boson model and had never before been observed. An extension of the spin-boson model was needed to match the theoretical predictions. Inset shows the superconducting flux qubit used in this work, the arrows represent the superposition of persistent current states of the qubit.

Will Zeng from Rigetti visits us

We have recently received a distinguished visitor at QUANTIC, Will Zeng who is one of the software leaders in the new startup Rigetti Computing, which aim at building a quantum computer. The company recently opened up their 19-qubit small quantum computer for remote user access through their cloud environment. The researchers at QUANTIC are already testing this new technological wonder.

Will led the development of the software and theory teams at Rigetti Computing, including the Forest quantum programming environment.  He started working with superconducting qubits in Michel Devoret and Andreas Wallraff’s labs before his PhD at Oxford on the mathematical structure of quantum algorithms.

It was nice having you around Will!

Will and Alba posing in front of Mare Nostrum 4 at BSC.

We are on Twitter!

Our group has launched a twitter account, @QUANTIC_BSC

Our twitter profile. It’s a Q, using the loop of a flux qubit.

We will be generating content as news from our group and from the world on quantum computation, simulation and in general quantum technologies unfold.

Follow us if you want to be up to date!

Workshop Bilbao Quantum Computation and Simulation

Last week one of the most important events this year on Quantum Computation and Simulation took place in Bilbao. The workshop gathered some of the experts in the field from all over the world, both in the experimental as well as the theory areas. As a novelty, a round table including representatives of the quantum technology industry was chaired by Víctor Canivell, president of the Quantum World Association. Prof. J. I. Latorre participated in the table as a partner of the consultancy Entanglement Partners.

Our group was represented at the workshop as organizers (Pol Forn-Díaz and José Ignacio Latorre) and as presenters. Artur García-Sáez presented his latest work on a non-trivial and potentially useful new quantum algorithm, the adiabatically-assisted variational quantum eigensolver (AAVQE) that caused some sensation. This work is the first project at QUANTIC seeing the light.

Artur García-Sáez introducing the Quantic group in his talk about quantum eigensolvers.