Ultrastrong Jaynes-Cummings model

Abstract

We propose a reliable scheme to realize the ultrastrong Jaynes-Cummings (JC) model by simultaneously modulating the resonance frequencies of the two-level system and the bosonic mode in the ultrastrong quantum Rabi model. We find that in both the high-and low-frequency modulation regimes, the counter-rotating terms can be completely suppressed without reducing the coupling strength of the rotating-wave terms, and hence the ultrastrong JC Hamiltonian is achieved. The ultrastrong JC interaction can not only be used to implement ultrafast quantum operations, but also will open up a new route to the demonstration of quantum phase transition associated with the JC Hamiltonian across the deep-strong coupling point. Some discussions on the experimental implementation of this scheme with circuit-QED systems are presented.

Noncommutative graphs based on finite-infinite system couplings: Quantum error correction for a qubit coupled to a coherent field

“…cavity QED, e.g. [31][32][33][34][35][36][37][38][39][40][41][42][43][44], including in strong [32], ultrastrong [34][35][36] and deep strong coupling regimes [34][35][36][37][38][39]. We take for example of the weak coupling regime the parameters used in experiments performed in the group of Serge Haroche [31].…”

“…In these regimes the Rabi model is non-integrable and investigating these regimes motivates describing eigen-energies approximations for this model [37,40]. One can show [36] that introducing a special type of frequency modulations applied to the field and the qubit will give the dynamics governed by Jaynes-Cummings Hamiltonian with γ f in the range of deep strong coupling regime. In circuit-QED simulations rates of γ f for Rabi model up to 2.1 are achieved [38,39].…”

Indirect Measurement for Optimal Quantum Communication Enhanced by Binary Non-standard Coherent States

“…In other words, it is possibly easier to implement our indirect measurement than Dolinar-like receivers. As the experimental implentation of ultrastrong Jaynes-Cummings model is still actively studied [32], the indirect measurement considered in this article can be expected to be implemented in the near future.…”

Adiabatic preparation of maximum entanglement in hybrid quantum systems with the Z 2 symmetry

“…This investigation originates from the symmetry breaking of the Jaynes–Cummings (JC) model around its resonance point 26,27 . Here we propose an adiabatic method for preparing the maximum entanglement of an in‐dressed NV spin and a nanotube carried with a tunable DC.…”