論文リスト

@article{PhysRevA.111.022619,

title = {Quantum state estimation of multipartite single-photon path entanglement via local measurements},

author = {Hikaru Shimizu and Joe Yoshimoto and Kazufumi Tanji and Aruto Hosaka and Junko Ishi-Hayase and Tomoyuki Horikiri and Rikizo Ikuta and Masahiro Takeoka},

url = {https://link.aps.org/doi/10.1103/PhysRevA.111.022619},

doi = {10.1103/PhysRevA.111.022619},

year  = {2025},

date = {2025-02-18},

urldate = {2025-02-01},

journal = {Phys. Rev. A},

volume = {111},

issue = {2},

pages = {022619},

publisher = {American Physical Society},

note = {Editors' Suggestion},

keywords = {entanglement, multi-photon interference, quantum internet},

pubstate = {published},

tppubtype = {article}

}

@article{Murakami:25,

title = {Low-noise quantum frequency conversion with cavity enhancement of the converted mode},

author = {Shoichi Murakami and Toshiki Kobayashi and Shigehito Miki and Hirotaka Terai and Tsuyoshi Kodama and Tsuneaki Sawaya and Akihiko Ohtomo and Hideki Shimoi and Takashi Yamamoto and Rikizo Ikuta},

url = {https://opg.optica.org/opticaq/abstract.cfm?URI=opticaq-3-1-55},

doi = {10.1364/OPTICAQ.542350},

year  = {2025},

date = {2025-01-29},

urldate = {2025-02-01},

journal = {Optica Quantum},

volume = {3},

number = {1},

pages = {55–63},

publisher = {Optica Publishing Group},

abstract = {Quantum frequency conversion (QFC), which converts the frequencies of photons while preserving the quantum state, is an essential technology for realizing the quantum internet and quantum interconnect. In the QFC from the visible to the telecom wavelengths around 1.5 µm, it is widely known that noise photons produced by the strong pump light used for the process contaminate the frequency-converted photon. It degrades the quality of the quantum property of the output photon. Conventional experiments have employed external narrowband frequency filters to eliminate the noise photons. In this study, we present a compact QFC device integrating the cavity structure only for the converted mode. While the cavity structure enhances both the desired efficiency and the noise photon generation, we show that the cavity-enhanced QFC followed by a relatively wide bandpass filter achieves a signal-to-noise ratio (SNR) comparable to conventional systems using external narrowband filters. We experimentally demonstrate the cavity-enhanced QFC for a single photon, converting it from 780 nm to 1540 nm, and successfully observe the non-classical photon statistics after conversion.},

keywords = {quantum frequency conversion, quantum internet},

pubstate = {published},

tppubtype = {article}

}

@article{OE494313,

title = {Quantum frequency conversion using 4-port fiber-pigtailed PPLN module},

author = {Shoichi Murakami and Rintaro Fujimoto and Toshiki Kobayashi and Rikizo Ikuta and Asuka Inoue and Takeshi Umeki and Shigehito Miki and Fumihiro China and Hirotaka Terai and Ryoichi Kasahara and Tetsuya Mukai and Nobuyuki Imoto and Takashi Yamamoto },

doi = {10.1364/OE.494313},

year  = {2023},

date = {2023-08-17},

urldate = {2023-08-17},

journal = {Optics Express},

volume = {31},

issue = {18},

pages = {29271-29279},

keywords = {entanglement, quantum frequency conversion, quantum internet},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevA.108.012612,

title = {Efficient Dicke-state distribution in a network of lossy channels},

author = {Wojciech Roga and Rikizo Ikuta and Tomoyuki Horikiri and Masahiro Takeoka},

url = {https://link.aps.org/doi/10.1103/PhysRevA.108.012612},

doi = {10.1103/PhysRevA.108.012612},

year  = {2023},

date = {2023-07-12},

urldate = {2023-07-01},

journal = {Phys. Rev. A},

volume = {108},

issue = {1},

pages = {012612},

publisher = {American Physical Society},

keywords = {entanglement, quantum internet, quantum repeater},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimoto:22,

title = {Entanglement distribution using a biphoton frequency comb compatible with DWDM technology},

author = {Rintaro Fujimoto and Tomohiro Yamazaki and Toshiki Kobayashi and Shigehito Miki and Fumihiro China and Hirotaka Terai and Rikizo Ikuta and Takashi Yamamoto},

url = {http://opg.optica.org/oe/abstract.cfm?URI=oe-30-20-36711},

doi = {10.1364/OE.469344},

year  = {2022},

date = {2022-09-01},

urldate = {2022-09-01},

journal = {Optics Express},

volume = {30},

number = {20},

pages = {36711--36716},

publisher = {Optica Publishing Group},

abstract = {We demonstrate a distribution of frequency-multiplexed polarization-entangled photon pairs over 16 frequency channels using demultiplexers for the signal and idler photons with a frequency spacing of 25 GHz, which is compatible with dense wavelength division multiplexing (DWDM) technology. Unlike conventional frequency-multiplexed photon-pair distribution by a broadband spontaneous parametric down-conversion (SPDC) process, we use photon pairs produced as a biphoton frequency comb by SPDC inside a cavity where one of the paired photons is confined. Owing to the free spectral range of 12.5 GHz and the finesse of over 10 of the cavity, the generated photons having a narrow linewidth in one channel are separated well from those in the other channels, which minimizes channel cross-talk in advance. The observed fidelities of the photon pairs range from 81 % to 96 % in the 16 channels. The results show the usefulness of the polarization-entangled biphoton frequency comb for frequency-multiplexed entanglement distribution via a DWDM system.},

keywords = {entanglement, optical cavity, quantum frequency comb, quantum internet},

pubstate = {published},

tppubtype = {article}

}

@article{Ikuta2022,

title = {Optical Frequency Tweezers},

author = {Rikizo Ikuta and Masayo Yokota and Toshiki Kobayashi and Nobuyuki Imoto and Takashi Yamamoto},

url = {https://link.aps.org/doi/10.1103/PhysRevApplied.17.034012},

doi = {10.1103/PhysRevApplied.17.034012},

year  = {2022},

date = {2022-03-04},

urldate = {2022-03-04},

journal = {Physical Review Applied},

volume = {17},

pages = {034012},

abstract = {We show a concept of optical frequency tweezers for tweezing light in the optical frequency domain with a high resolution, which is the frequency version of optical tweezers for the spatial manipulation of microscopic objects. We report a proof-of-principle experiment via frequency conversion inside a cavity only for the converted light. Owing to the atypical configuration, the experiment successfully achieves the tweezing operation in the frequency domain, which picks light at a target frequency from the frequency-multiplexed input light and converts it to a different frequency, without touching any other light sitting in different frequency positions and shaking the frequency by the pump light.},

keywords = {quantum frequency comb, quantum internet},

pubstate = {published},

tppubtype = {article}

}

@article{Ikuta2019,

title = {Frequency-Multiplexed Photon Pairs Over 1000 Modes from a Quadratic Nonlinear Optical Waveguide Resonator with a Singly Resonant Configuration},

author = {Rikizo Ikuta and Ryoya Tani and Masahiro Ishizaki and Shigehito Miki and Masahiro Yabuno and Hirotaka Terai and Nobuyuki Imoto and Takashi Yamamoto },

url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.193603},

doi = {10.1103/PhysRevLett.123.193603},

year  = {2019},

date = {2019-11-08},

urldate = {2019-11-08},

journal = {Phys. Rev. Lett.},

volume = {123},

pages = {193603},

organization = {arXiv},

abstract = {We demonstrate a frequency multiplexed photon pair generation based on a quadratic nonlinear optical waveguide inside a cavity which confines only signal photons without confining idler photons and the pump light. We monolithically constructed the photon pair generator by a periodically poled lithium niobate (PPLN) waveguide with a high reflective coating for the signal photons around 1600 nm and with antireflective coatings for the idler photons around 1520 nm and the pump light at 780 nm at the end faces of the PPLN waveguide. We observed a comblike photon pair generation with a mode spacing of the free spectral range of the cavity. Unlike the conventional multiple resonant photon pair generation experiments, the photon pair generation was incessant within a range of 80 nm without missing teeth due to a mismatch of the energy conservation and the cavity resonance condition of the photons, resulting in over 1000-mode frequency multiplexed photon pairs in this range.},

keywords = {optical cavity, quantum frequency comb, quantum internet},

pubstate = {published},

tppubtype = {article}

}