# science

#### Digital-analog mapping of spin models on a trapped-ion architecture (DAQS)

I. Arrazola, J. S. Pedernales, L. Lamata, and E. Solano, “Digital-Analog Quantum Simulation of Spin Models in Trapped Ions”, Sci. Rep. 6, 30534 (2016). These original ideas for trapped ions inspired us to go ahead with further models in superconducting circuits and other quantum platforms. Link

#### Digital-analog quantum simulation of interacting fermions via exchange of bosons in quantum field theories (DAQS)

L. García-Álvarez, J. Casanova, A. Mezzacapo, I. L. Egusquiza, L. Lamata, G. Romero, and E. Solano, “Fermion-Fermion Scattering in Quantum Field Theory with superconducting circuits”, Phys. Rev. Lett. 114, 070502 (2015). In this work, we were able to describe a modular architecture for quantum computation of scattering processes between fermions, like electrons, via exchange of […]

#### Mapping unphysical operations on a physical architecture in ion traps (CDQS)

X. Zhang, Y. Shen, J. Zhang, J. Casanova, L. Lamata, E. Solano, M.-H. Yung, J.-N. Zhang, and K. Kim, “Time Reversal and Charge Conjugation in an Embedding Quantum Simulator”, Nat. Commun. 6, 7917 (2015). Key experiment proving our prediction on how modular co-design concepts work nicely in the lab, in this case trapped ions. Link

#### Digital-analog quantum simulator of fluid dynamics (DAQS)

A. Mezzacapo, M. Sanz, L. Lamata, I. L. Egusquiza, S. Succi, and E. Solano, “Quantum Simulator for Transport Phenomena in Fluid Flows”, Sci. Rep. 5, 13153 (2015). The pioneeing article dealing with the problem on how to approach quantum simulation/computation of fluid dynamics model. The highly nonlinear case may only be develop in Co-Design Quantum […]

#### Digital-analog quantum simulation of quantum chemistry (DAQS)

M.-H. Yung, J. Casanova, A. Mezzacapo, J. McClean, L. Lamata, A. Aspuru-Guzik, and E. Solano, “From transistor to trapped-ion computers for quantum chemistry”, Sci. Rep. 4, 3589 (2014). This is the pioneering paper where celebrated VQE algorithm was applied to quantum chemistry models in trapped ions. These ideas were taken by top experimental groups in […]

#### Transforming an analog block into another one by single-qubit pulses (DAQS)

J. S. Pedernales, R. Di Candia, D. Ballester, E. Solano, “Quantum Simulations of Relativistic Quantum Physics in Circuit QED”, New J. Phys. 15, 055008 (2013). Here, we applied a known co-design method and found a mysterious coincidence in mathematical structure between light-matter interactions and relativistic Dirac equations, similar to the ones appearing in monolayer and […]

#### Embedding quantum simulators to measure entanglement (EQS)

R. Di Candia, B. Mejia, H. Castillo, J. S. Pedernales, J. Casanova, and E. Solano, “Embedding Quantum Simulators for Quantum Computation of Entanglement”, Phys. Rev. Lett 111, 240502 (2013). In this manuscript, we develop the full theory of embedding quantum simulators/computers to reproduce antilinear operations, which are unphysical but present in useful applications. In particular, […]

#### Transforming an analog block into another one by single-qubit pulses (DAQS)

D. Ballester, G. Romero, J. J. García-Ripoll, F. Deppe, and E. Solano, “Quantum simulation of the ultrastrong coupling dynamics in circuit QED”, Phys. Rev. X 2, 021007 (2012). Here, we developed first tools for creating Co-Design counter-rotating terms, associated with a pseudo-violation of energy conservation, onto a conventional light-matter interaction model. In that way we […]

#### Quantum simulation of materials with interacting fermions and bosons (DAQS)

A. Mezzacapo, J. Casanova, L. Lamata, and E. Solano, “Digital Quantum Simulation of the Holstein Model in Trapped Ions”, Phys. Rev. Lett. 109, 200501 (2012). In this work, we developed the pioneering Co-Design quantum simulation/computation of materials involving fermions coupled to bosons, where bosons are represented by bosons, as it should be for efficiency reasons. […]

#### Mapping unphysical operations on a physical architecture (EQS)

J. Casanova, C. Sabín, J. León, I. L. Egusquiza, R. Gerritsma, C. Roos, J. J. García-Ripoll, and E. Solano, “Quantum Simulation of the Majorana Equation and Unphysical Operations”, Phys. Rev. X 1, 021018 (2011). Here, we enhanced the architecture possibilities of quantum simulations/computations involving mathematical models that do not have a direct mapping on a […]