Generation of tunable quantum entanglement via nonlinearity symmetry breaking in semiconductor metasurfaces
| Autor: | Ma, Jinyong, Fan, Tongmiao, Haggren, Tuomas, Molina, Laura Valencia, Parry, Matthew, Shinde, Saniya, Zhang, Jihua, Morales, Rocio Camacho, Setzpfandt, Frank, Tan, Hark Hoe, Jagadish, Chennupati, Neshev, Dragomir N., Sukhorukov, Andrey A. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Tunable biphoton quantum entanglement generated from nonlinear processes is highly desirable for cutting-edge quantum technologies, yet its tunability is substantially constrained by the symmetry of material nonlinear tensors. Here, we overcome this constraint by introducing symmetry-breaking in nonlinear polarization to generate optically tunable biphoton entanglement at picosecond speeds. Asymmetric optical responses have made breakthroughs in classical applications like non-reciprocal light transmission. We now experimentally demonstrate the nonlinear asymmetry response for biphoton entanglement using a semiconductor metasurface incorporating [110] InGaP nano-resonators with structural asymmetry. We realize continuous tuning of polarization entanglement from near-unentangled states to a Bell state. This tunability can also extend to produce tailored hyperentanglement. Furthermore, our nanoscale entanglement source features an ultra-high coincidence-to-accidental ratio of $\approx7\times10^4$, outperforming existing semiconductor flat optics by two orders of magnitude. Introducing asymmetric nonlinear response in quantum metasurfaces opens new directions for tailoring on-demand quantum states and beyond. Comment: 27 pages, 4 figures |
| Databáze: | arXiv |
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