Quantum Hysteresis in Coupled Light–Matter Systems

Gómez-Ruiz, Fernando Javier; Acevedo, O. L.; Quiroga, Luis; Rodríguez, F. J.; Johnson, Neil F.

doi:10.3390/e18090319

Cited by 11 publications

(8 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our findings have further implications. First, this discrete staircase of LA-zeros not only appears for the QRM, but it also shows signs of existing for multi-qubit systems (Dicke model) and with more complicated time varying couplings [35]. Although a comprehensive treatment of the scaling of such complex systems remains to be explored, our results open up a path to tailoring zeros of the LA using a time-dependent interaction and by increasing the number of qubits.…”

mentioning

confidence: 67%

Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system

Betancourt,

Rodríguez,

Quiroga

et al. 2021

Preprint

View full text Add to dashboard Cite

We uncover a remarkably regular array of singularity-like structures within the deep strongcoupling limit of qubit-oscillator (e.g. light-matter) systems described by the quantum Rabi model, as a function of time and coupling strength. These non-analytic anomalies in the Loschmidt amplitude (echoes) suggest the existence of new forms of dynamical phase transition within this deep strong-coupling regime. The key feature whereby the initial state collapses into orthogonal states at select values of the interaction strength and select times, may be used to enhance -or attackquantum information processing or computation schemes that rely on removing -or retaining -a given quantum state.

show abstract

mentioning

confidence: 67%

Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system

Betancourt,

Rodríguez,

Quiroga

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Though we take λ(t) to be a piecewise linear updown ramping of duration υ −1 (i.e. the inverse ramping velocity), similar results occur for other up-down forms since the dense entanglement regime at intermediate υ is generated by path interference as a result of two crossings of the quantum critical point λ c = 0.5 [54,55,60]. In particular, the shaded forms in Fig.…”

mentioning

confidence: 74%

Functional advantages offered by many-body coherences in biochemical systems

Gómez-Ruiz¹,

Acevedo²,

Rodríguez³

et al. 2017

Preprint

View full text Add to dashboard Cite

Quantum coherence phenomena driven by electronic-vibrational (vibronic) interactions, are being reported in many pulse (e.g. laser) driven chemical and biophysical systems. But what systems-level advantage(s) do such many-body coherences offer to future technologies? We address this question for pulsed systems of general size N , akin to the LHCII aggregates found in green plants. We show that external pulses generate vibronic states containing particular multipartite entanglements, and that such collective vibronic states increase the excitonic transfer efficiency. The strength of these many-body coherences and their robustness to decoherence, increase with aggregate size N and do not require strong electronic-vibrational coupling. The implications for energy and information transport are discussed.

show abstract

“…This range varies from the slow near adiabatic regime, through the intermediate regime, to the fast sudden quench regime. In previous papers, we showed how the values of the velocity for which the change of regime is manifested depend on system size [20,[34][35][36]. Here, on the other hand, we take a fixed size of the qubit subsystem, namely N=81, for all the numerical calculations.…”

Section: Resultsmentioning

confidence: 99%

Dynamics of entanglement and the Schmidt gap in a driven light–matter system

Gómez-Ruiz

Mendoza‐Arenas

Acevedo

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

The ability to modify light-matter coupling in time (e.g. using external pulses) opens up the exciting possibility of generating and probing new aspects of quantum correlations in many-body lightmatter systems. Here we study the impact of such a pulsed coupling on the light-matter entanglement in the Dicke model as well as the respective subsystem quantum dynamics. Our dynamical many-body analysis exploits the natural partition between the radiation and matter degrees of freedom, allowing us to explore time-dependent intra-subsystem quantum correlations by means of squeezing parameters, and the intersubsystem Schmidt gap for different pulse duration (i.e. ramping velocity) regimes -from the near adiabatic to the sudden quench limits. Our results reveal that both types of quantities indicate the emergence of the superradiant phase when crossing the quantum critical point. In addition, at the end of the pulse light and matter remain entangled even though they become uncoupled, which could be exploited to generate entangled states in non-interacting systems.

show abstract

Quantum Hysteresis in Coupled Light–Matter Systems

Cited by 11 publications

References 60 publications

Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system

Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system

Functional advantages offered by many-body coherences in biochemical systems

Dynamics of entanglement and the Schmidt gap in a driven light–matter system

Contact Info

Product

Resources

About