Embedding Quantum Simulators

R. Di Candia^a, B. Mejia^b, H. Castillo^b, J. S. Pedernales^a, J. Casanova^a, and E. Solano^a,c

^aDepartment of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, 48080 Bilbao, Spain

^bDepartamento de Ciencias, Pontificia Universidad Católica del Perú, Apartado 1761, Peru

^cIKERBASQUE, Basque Foundation for Science, Alameda Urquijo 36, 48011 Bilbao, Spain

We introduce the concept of embedding quantum simulators, a paradigm allowing efficient computation of dynamical quantities requiring full quantum tomography in a standard quantum simulator (one-to-one quantum simulator). The concept consists in the suitable encoding of a simulated quantum dynamics in the enlarged Hilbert space of an embedding quantum simulator. In this manner, non-trivial quantities are mapped onto physical observables, overcoming the necessity of full tomography, and reducing drastically the experimental requirements. As examples, we discuss how to evaluate entanglement monotones and time correlation functions, each in a suitable embedding quantum simulator. Finally, we expect that the proposed embedding framework paves the way for a general theory of enhanced one-to-one quantum simulators.

[1] R. Di Candia, B. Mejia, H. Castillo, J. S. Pedernales, J. Casanova, and E. Solano, Phys. Rev. Lett. 111, 240502 (2013)

[2] J. S. Pedernales, R. Di Candia, P. Schindler, T. Monz, M. Hennrich, J. Casanova, and E. Solano, Arxiv:1402:4409 (2014)