Conditional phase gate between two photons through control of the interaction time with a single atom in a cavity

Autor:	Hassan, Arkan, Gea-Banacloche, Julio
Rok vydání:	2023
Předmět:	Quantum Physics
Druh dokumentu:	Working Paper
Popis:	We show that the simultaneous interaction of two single-photon fields with a single atom in the V configuration can in principle produce a conditional phase gate of arbitrarily high fidelity, for an appropriate choice of the interaction time, as long as the fields con be described by a single temporal mode (as in an optical cavity); this requires a ``gated'' interaction, where, e.g., dynamical coupling techniques could be used to get the fields in and out of the cavity, and a large detuning induced by a strong external field could be used to turn the atom-field interaction on and off at the right times. With these assumptions, our analysis shows that the largest gate fidelities are obtained for a cavity containing a single atom, and that adding more atoms in effect ``dilutes'' the system's nonlinearity. We also study how spontaneous emission losses into non-cavity modes degrade the fidelity, and consider as well a couple of alternate atomic level schemes, namely two- and five-level systems. Comment: Changes made in response to reviewers include: title and abstract, corrections to errors made in the calculations reported in the appendix in the first version (which do not change any of our conclusions), and a definition of the gate fidelity that is the square of the one previously used
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2306.01897 Zobrazit plný text záznamu View this record from Arxiv