論文リスト

@article{nokey,

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

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

url = {https://doi.org/10.1364/OE.494313 },

doi = {https://doi.org/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, multi-photon interference, optomechanics, quantum frequency conversion},

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{Yamazaki2022,

title = {Massive-mode polarization entangled biphoton frequency comb},

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

url = {https://www.nature.com/articles/s41598-022-12691-7},

doi = {https://doi.org/10.1038/s41598-022-12691-7},

year  = {2022},

date = {2022-05-28},

urldate = {2022-05-28},

journal = {Scientific Reports},

volume = {12},

number = {8964},

pages = {1 -- 8},

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

pubstate = {published},

tppubtype = {article}

}

@article{Fujimoto2021,

title = {Entangled photon pair detection by superconducting nanowire single-photon detectors with a single-flux-quantum coincidence circuit},

author = {Rintaro Fujimoto and Shoichi Murakami and Toshiki Kobayashi and Rikizo Ikuta and Shigehito Miki and Shigeyuki Miyajima and Masahiro Yabuno and Fumihiro China and Hirotaka Terai and Nobuyuki Imoto and Takashi Yamamoto},

url = {https://iopscience.iop.org/article/10.35848/1882-0786/ac211e/meta},

doi = {https://doi.org/10.35848/1882-0786/ac211e},

year  = {2021},

date = {2021-09-07},

urldate = {2021-09-07},

journal = {Appl. Phys. Express},

volume = {14},

number = {10},

pages = {102001},

abstract = {We demonstrated the coincidence measurement of quantum light by superconducting nanowire single-photon detectors with a single-flux-quantum (SFQ) circuit as a signal processing circuit. By the quantum state tomography of a polarization-entangled photon pair, we evaluated the detection system based on the SFQ coincidence circuit. The estimated fidelity was almost the same value as that measured by using a detection system based on a conventional time-to-digital converter.},

keywords = {entanglement, superconducting detector},

pubstate = {published},

tppubtype = {article}

}

@article{Miyanishi2020,

title = {Robust entanglement distribution via telecom fibre assisted by an asynchronous counter-propagating laser light},

author = {Koichiro Miyanishi and Yoshiaki Tsujimoto and Rikizo Ikuta and Shigehito Miki and Masahiro Yabuno and Taro Yamashita and Hirotaka Terai and Takashi Yamamoto and Masato Koashi and Nobuyuki Imoto },

doi = {10.1038/s41534-020-0273-5},

year  = {2020},

date = {2020-05-20},

journal = {npj Quantum Information},

volume = {6},

number = {44},

abstract = {Distributing entangled photon pairs over noisy channels is an important task for various quantum information protocols. Encoding an entangled state in a decoherence-free subspace (DFS) formed by multiple photons is a promising way to circumvent the phase fluctuations and polarisation rotations in optical fibres. Recently, it has been shown that the use of a counter-propagating coherent light as an ancillary photon enables us to faithfully distribute entangled photon with success probability proportional to the transmittance of the optical fibres. Several proof-of-principle experiments have been demonstrated, in which entangled photon pairs from a sender side and the ancillary photon from a receiver side originate from the same laser source. In addition, bulk optics have been used to mimic the noises in optical fibres. Here, we demonstrate a DFS-based entanglement distribution over 1 km optical fibre using DFS formed by using fully independent light sources at the telecom band, and obtain a high-fidelity entangled state. This shows that the DFS-based scheme protects the entanglement against collective noise in 1 km optical fibre. In the experiment, we utilise an interference between asynchronous photons from continuous wave pumped spontaneous parametric down conversion (SPDC) and mode-locked coherent light pulse. After performing spectral and temporal filtering, the SPDC photons and light pulse are spectrally indistinguishable. This property allows us to observe high-visibility interference without performing active synchronisation between fully independent sources.},

keywords = {entanglement},

pubstate = {published},

tppubtype = {article}

}

@article{asano2015distillation,

title = {Distillation of photon entanglement using a plasmonic metamaterial},

author = {Motoki Asano and Muriel Bechu and Mark Tame and {Ş}ahin K Özdemir and Rikizo Ikuta and Durdu Ö Güney and Takashi Yamamoto and Lan Yang and Martin Wegener and Nobuyuki Imoto},

doi = {10.1038/srep18313},

year  = {2015},

date = {2015-12-01},

journal = {Scientific reports},

volume = {5},

pages = {18313},

publisher = {Nature Publishing Group},

keywords = {entanglement, metamaterial},

pubstate = {published},

tppubtype = {article}

}

@article{1367-2630-16-2-023005,

title = {Universal gates for transforming multipartite entangled Dicke states},

author = {Toshiki Kobayashi and Rikizo Ikuta and {Ş}ahin K Özdemir and Mark Tame and Takashi Yamamoto and Masato Koashi and Nobuyuki Imoto},

url = {http://stacks.iop.org/1367-2630/16/i=2/a=023005},

year  = {2014},

date = {2014-02-01},

journal = {New Journal of Physics},

volume = {16},

number = {2},

pages = {023005},

abstract = {We determine the minimal number of qubits that it is necessary to have access to in order to transform Dicke states into other Dicke states. In general, the number of qubits in Dicke states cannot be increased via transformation gates by accessing only a single qubit, in direct contrast to other multipartite entangled states such as GHZ, W and cluster states. We construct a universal optimal gate which adds spin-up qubits or spin-down qubits to any Dicke state by minimal access. We also show the existence of a universal gate which transforms any size of Dicke state as long as it has access to at least the required number of qubits. Our results have important consequences for the generation of Dicke states in physical systems such as ion traps, all-optical setups and cavity-quantum electrodynamic settings where they can be used for a variety of quantum information processing tasks.},

keywords = {entanglement},

pubstate = {published},

tppubtype = {article}

}

@article{Yamamoto2003,

title = {Experimental extraction of an entangled photon pair from two identically decohered pairs},

author = {Takashi Yamamoto and Masato Koashi and {Ş}ahin K Özdemir and Nobuyuki Imoto},

url = {https://www.nature.com/articles/nature01358},

doi = {10.1038/nature01358},

year  = {2003},

date = {2003-01-23},

journal = {Nature},

volume = {421},

pages = {343–346},

keywords = {entanglement},

pubstate = {published},

tppubtype = {article}

}

@article{Yamamoto2002,

title = {Polarization entangled W state using parametric down-conversion},

author = {Takashi Yamamoto and Kiyoshi Tamaki and Masato Koashi and Nobuyuki Imoto},

url = {https://doi.org/10.1103/PhysRevA.66.064301},

doi = {10.1103/PhysRevA.66.064301},

year  = {2002},

date = {2002-12-06},

journal = {Phys. Rev. A},

volume = {66},

pages = {064301 },

keywords = {entanglement},

pubstate = {published},

tppubtype = {article}

}

@article{Yamamoto2001,

title = {Concentration and purification scheme for two partially entangled photon pairs},

author = {Takashi Yamamoto and Masato Koashi and Nobuyuki Imoto},

url = {https://doi.org/10.1103/PhysRevA.64.012304},

doi = {10.1103/PhysRevA.64.012304},

year  = {2001},

date = {2001-06-04},

journal = {Phys. Rev. A},

volume = {64},

pages = {012304},

keywords = {entanglement},

pubstate = {published},

tppubtype = {article}

}

@article{Koashi2001,

title = {Probabilistic manipulation of entangled photons},

author = {Masato Koashi and Takashi Yamamoto and Nobuyuki Imoto},

url = {https://doi.org/10.1103/PhysRevA.63.030301},

doi = {10.1103/PhysRevA.63.030301},

year  = {2001},

date = {2001-02-12},

journal = {Phys. Rev. A},

volume = {63},

number = {030301(R)},

keywords = {entanglement, multi-photon interference},

pubstate = {published},

tppubtype = {article}

}