Two-photon quantum Rabi model with superconducting circuits

Autor(es)

Felicetti, S. ; Rossatto, D. Z. ; Rico, E. ; Solano, E. ; Forn-Diaz, P.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW A; v. 97, n. 1, p. 11-pg., 2018-01-30.

Resumo

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)

• Processo FAPESP: 13/23512-7 - Eletrodinâmica Quântica de Circuitos: Biestabilidade e Estados Comprimidos
• Beneficiário: Daniel Zini Rossatto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/24576-1 - Regimes de acoplamento ultraforte e extremamente forte em eletrodinâmica quântica de circuitos
• Beneficiário: Daniel Zini Rossatto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado