Indistinguishable MHz-narrow heralded photon pairs from a whispering gallery resonator
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866929642499211264 |
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| author | Huang, Sheng-Hsuan Dirmeier, Thomas Shafiee, Golnoush Laiho, Kaisa Strekalov, Dmitry V. Aiello, Andrea Leuchs, Gerd Marquardt, Christoph |
| author_facet | Huang, Sheng-Hsuan Dirmeier, Thomas Shafiee, Golnoush Laiho, Kaisa Strekalov, Dmitry V. Aiello, Andrea Leuchs, Gerd Marquardt, Christoph |
| contents | Hong-Ou-Mandel interference plays a vital role in many quantum optical applications where indistinguishability of two photons is important. Such photon pairs are commonly generated as the signal and idler in the frequency and polarization-degenerate spontaneous parametric down conversion~(SPDC). To scale this approach to a larger number of photons we demonstrate how two independent signal photons radiated into different spatial modes can be rendered conditionally indistinguishable by a heralding measurement performed on their respective idlers. We use the SPDC in a whispering gallery resonator, which is already proven to be versatile sources of quantum states. Its extreme conversion efficiency allowed us to perform our measurements with only \qty{50}{nW} of in-coupled pump power in each propagation direction. The Hong-Ou-Mandel interference of two counter-propagating signal photons manifested itself in the four-fold coincidence rate, where the two idler photons detection heralds a pair of signal photons with a desired temporal overlap. We achieved the Hong-Ou-Mandel dip contrast of \(74\pm 5\%\). Importantly, the optical bandwidth of all involved photons is of the order of a MHz and is continuously tunable. This, on the one hand, makes it possible to achieve the necessary temporal measurements resolution with standard electronics, and on the other hand, creates a quantum states source compatible with other candidates for qubit implementation, such as optical transitions in solid-state or vaporous systems. We also discuss the possibility of generating photon pairs with similar temporal modes from two different whispering gallery resonators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15760 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Indistinguishable MHz-narrow heralded photon pairs from a whispering gallery resonator Huang, Sheng-Hsuan Dirmeier, Thomas Shafiee, Golnoush Laiho, Kaisa Strekalov, Dmitry V. Aiello, Andrea Leuchs, Gerd Marquardt, Christoph Quantum Physics Optics Hong-Ou-Mandel interference plays a vital role in many quantum optical applications where indistinguishability of two photons is important. Such photon pairs are commonly generated as the signal and idler in the frequency and polarization-degenerate spontaneous parametric down conversion~(SPDC). To scale this approach to a larger number of photons we demonstrate how two independent signal photons radiated into different spatial modes can be rendered conditionally indistinguishable by a heralding measurement performed on their respective idlers. We use the SPDC in a whispering gallery resonator, which is already proven to be versatile sources of quantum states. Its extreme conversion efficiency allowed us to perform our measurements with only \qty{50}{nW} of in-coupled pump power in each propagation direction. The Hong-Ou-Mandel interference of two counter-propagating signal photons manifested itself in the four-fold coincidence rate, where the two idler photons detection heralds a pair of signal photons with a desired temporal overlap. We achieved the Hong-Ou-Mandel dip contrast of \(74\pm 5\%\). Importantly, the optical bandwidth of all involved photons is of the order of a MHz and is continuously tunable. This, on the one hand, makes it possible to achieve the necessary temporal measurements resolution with standard electronics, and on the other hand, creates a quantum states source compatible with other candidates for qubit implementation, such as optical transitions in solid-state or vaporous systems. We also discuss the possibility of generating photon pairs with similar temporal modes from two different whispering gallery resonators. |
| title | Indistinguishable MHz-narrow heralded photon pairs from a whispering gallery resonator |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2412.15760 |