Strong coupling between a single-photon and a two-photon Fock state
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915542709829632 |
|---|---|
| author | Wang, Shuai-Peng Mercurio, Alberto Ridolfo, Alessandro Wang, Yuqing Chen, Mo Wang, Wenyan Liu, Yulong Sun, Huanying Li, Tiefu Nori, Franco Savasta, Salvatore You, J. Q. |
| author_facet | Wang, Shuai-Peng Mercurio, Alberto Ridolfo, Alessandro Wang, Yuqing Chen, Mo Wang, Wenyan Liu, Yulong Sun, Huanying Li, Tiefu Nori, Franco Savasta, Salvatore You, J. Q. |
| contents | The realization of strong nonlinear coupling between single photons has been a long-standing goal in quantum optics and quantum information science, promising wide impact applications, such as all-optical deterministic quantum logic and single-photon frequency conversion. Here, we report an experimental observation of the strong coupling between a single-photon and a two-photon Fock state in an ultrastrongly-coupled circuit-QED system. This strong nonlinear interaction is realized by introducing a detuned flux qubit working as an effective coupler between two modes of a superconducting coplanar waveguide resonator. The ultrastrong light--matter interaction breaks the excitation number conservation, and an external flux bias breaks the parity conservation. The combined effect of the two enables the strong one--two-photon coupling. Quantum Rabi-like avoided crossing is resolved when tuning the two-photon resonance frequency of the first mode across the single-photon resonance frequency of the second mode. Within this new photonic regime, we observe the thresholdless second harmonic generation for a mean photon number below one. Our results represent a key step towards a new regime of quantum nonlinear optics, where individual photons can deterministically and coherently interact with each other in the absence of any stimulating fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_02738 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strong coupling between a single-photon and a two-photon Fock state Wang, Shuai-Peng Mercurio, Alberto Ridolfo, Alessandro Wang, Yuqing Chen, Mo Wang, Wenyan Liu, Yulong Sun, Huanying Li, Tiefu Nori, Franco Savasta, Salvatore You, J. Q. Quantum Physics The realization of strong nonlinear coupling between single photons has been a long-standing goal in quantum optics and quantum information science, promising wide impact applications, such as all-optical deterministic quantum logic and single-photon frequency conversion. Here, we report an experimental observation of the strong coupling between a single-photon and a two-photon Fock state in an ultrastrongly-coupled circuit-QED system. This strong nonlinear interaction is realized by introducing a detuned flux qubit working as an effective coupler between two modes of a superconducting coplanar waveguide resonator. The ultrastrong light--matter interaction breaks the excitation number conservation, and an external flux bias breaks the parity conservation. The combined effect of the two enables the strong one--two-photon coupling. Quantum Rabi-like avoided crossing is resolved when tuning the two-photon resonance frequency of the first mode across the single-photon resonance frequency of the second mode. Within this new photonic regime, we observe the thresholdless second harmonic generation for a mean photon number below one. Our results represent a key step towards a new regime of quantum nonlinear optics, where individual photons can deterministically and coherently interact with each other in the absence of any stimulating fields. |
| title | Strong coupling between a single-photon and a two-photon Fock state |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2401.02738 |