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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Two-photon quantum Rabi model with superconducting circuits

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Felicetti, S. [1] ; Rossatto, D. Z. [2] ; Rico, E. [3, 4] ; Solano, E. [3, 4, 5] ; Forn-Diaz, P. [6]
Total Authors: 5
[1] Univ Paris Diderot, CNRS, Sorbonne Paris Cite, Lab Mat & Phenomenes Quant, UMR 7162, F-75013 Paris - France
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Basque Country, UPV EHU, Dept Phys Chem, Apartado 644, E-48080 Bilbao - Spain
[4] Ikerbasque, Basque Fdn Sci, Maria Diaz de Haro 3, Bilbao 48013 - Spain
[5] Shanghai Univ, Dept Phys, Shanghai 200444 - Peoples R China
[6] BSC, C Jordi Girona 29, Barcelona 08034 - Spain
Total Affiliations: 6
Document type: Journal article
Source: Physical Review A; v. 97, n. 1 JAN 30 2018.
Web of Science Citations: 19

We propose a superconducting circuit to implement a two-photon quantum Rabi model in a solid-state device, where a qubit and a resonator are coupled by a two-photon interaction. We analyze the input-output relations for this circuit in the strong-coupling regime and find that fundamental quantum-optical phenomena are qualitatively modified. For instance, two-photon interactions are shown to yield a single-or two-photon blockade when a pumping field is either applied to the cavity mode or to the qubit, respectively. In addition, we derive an effective Hamiltonian for perturbative ultrastrong two-photon couplings in the dispersive regime, where two-photon interactions introduce a qubit-state-dependent Kerr term. Finally, we analyze the spectral collapse of the multiqubit two-photon quantum Rabi model and find a scaling of the critical coupling with the number of qubits. Using realistic parameters with the circuit proposed, three qubits are sufficient to reach the collapse point. (AU)

FAPESP's process: 13/23512-7 - Circuit Quantum Electrodynamics: Bistability and Squeezed States
Grantee:Daniel Zini Rossatto
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/24576-1 - Ultrastrong and deep strong coupling regimes in circuit quantum electrodynamics
Grantee:Daniel Zini Rossatto
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor