Parity-dependent State Engineering and Tomography in the ultrastrong coupling regime
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Date
2015-07-08Author
Felicetti, Simone
Douce, T.
Romero Huenchuñir, Guillermo Esteban
Milman, P.
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Scientific Reports 5 : (2015) // Article ID 11818
Abstract
Reaching the strong coupling regime of light-matter interaction has led to an impressive development in fundamental quantum physics and applications to quantum information processing. Latests advances in different quantum technologies, like superconducting circuits or semiconductor quantum wells, show that the ultrastrong coupling regime (USC) can also be achieved, where novel physical phenomena and potential computational benefits have been predicted. Nevertheless, the lack of effective decoupling mechanism in this regime has so far hindered control and measurement processes. Here, we propose a method based on parity symmetry conservation that allows for the generation and reconstruction of arbitrary states in the ultrastrong coupling regime of light-matter interactions. Our protocol requires minimal external resources by making use of the coupling between the USC system and an ancillary two-level quantum system.