189 citations · 525 across the 18 of their papers we have counts for
18 papers
Waveguide-array-based multiplexed photonic interface for atom array
Yuya Maeda, Toshiki Kobayashi, Takuma Ueno +12
The growing demand for high-capacity quantum communication and large-scale quantum computing underscores the importance of networking quantum processing units via multiplexed photo…
Channel-selective frequency up-conversion for frequency-multiplexed quantum network
Shoichi Murakami, Shunsuke Hiraoka, Toshiki Kobayashi +2
We demonstrate channel-selective frequency up-conversion from telecom wavelengths around 1540 nm for optical fiber communication to visible wavelengths around 780 nm, based on seco…
Logical entanglement distribution between distant 2D array qubits
Yuya Maeda, Yasunari Suzuki, Toshiki Kobayashi +3
Sharing logical entangled pairs between distant quantum nodes is a key process to achieve fault tolerant quantum computation and communication. However, there is a gap between curr…
1xN DWDM channel selective quantum frequency conversion
Tomoaki Arizono, Toshiki Kobayashi, Shigehito Miki +5
Dense Wavelength Division Multiplexing (DWDM) is a key technology for realizing high-capacity and flexible quantum communication networks. In addition, to realize the emerging quan…
Low-noise quantum frequency conversion with cavity enhancement of converted mode
Shoichi Murakami, Toshiki Kobayashi, Shigehito Miki +7
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 qu…
Linear Optical Quantum Computation with Frequency-Comb Qubits and Passive Devices
Tomohiro Yamazaki, Tomoaki Arizono, Toshiki Kobayashi +2
We propose a linear optical quantum computation scheme using time-frequency degree of freedom. In this scheme, a qubit is encoded in single-photon frequency combs, and manipulation…
Quantum state tomography of qudits via Hong-Ou-Mandel interference
Yoshiaki Tsujimoto, Rikizo Ikuta, Kentaro Wakui +2
We propose a method to perform the quantum state tomography (QST) of an -partite qudit state embedded in single photons using the Hong-Ou-Mandel (HOM) interference betw…
Optical frequency tweezers
Rikizo Ikuta, Masayo Yokota, Toshiki Kobayashi +2
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 the optical tweezers fo…
Massive-mode polarization entangled biphoton frequency comb
Tomohiro Yamazaki, Rikizo Ikuta, Toshiki Kobayashi +5
A frequency-multiplexed entangled photon pair and a high-dimensional hyperentangled photon pair are useful to realize a high-capacity quantum communication. A biphoton frequency co…
A cavity-enhanced broadband photonic Rabi oscillation
Rikizo Ikuta, Toshiki Kobayashi, Tomohiro Yamazaki +2
A coherent coupling among different energy photons provided by nonlinear optical interaction is regarded as a photonic version of the Rabi oscillation. Cavity enhancement of the no…
Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network
Rikizo Ikuta, Toshiki Kobayashi, Tetsuo Kawakami +8
Quantum network with a current telecom photonic infrastructure is deficient in quantum storages that keep arbitrary quantum state in sufficient time duration for a long-distance qu…
Mach-Zehnder interferometer using frequency-domain beamsplitter
Toshiki Kobayashi, Daisuke Yamazaki, Kenichiro Matsuki +7
We demonstrated the first-order interference between coherent light at 1580 nm and 795 nm by using frequency-domain Mach-Zehnder interferometer (MZI). The MZI is implemented by two…
Heralded single excitation of atomic ensemble via solid-state-based telecom photon detection
Rikizo Ikuta, Toshiki Kobayashi, Kenichiro Matsuki +7
Telecom photonic quantum networks with matter quantum systems enable a rich variety of applications, such as a long distance quantum cryptography and one-way quantum computing. Pre…
Frequency-domain Hong-Ou-Mandel interference
Toshiki Kobayashi, Rikizo Ikuta, Shuto Yasui +6
Hong-Ou-Mandel (HOM) interference unveils a distinct behavior of identical particles which cannot be distinguished from each other. Especially for bosons, two separated identical p…
A low-noise frequency down-conversion to the telecommunication band for a quantum communication based on NV centers in diamond
Rikizo Ikuta, Toshiki Kobayashi, Shuto Yasui +9
We demonstrate a low-noise frequency down-conversion of photons at 637 nm to the telecommunication band at 1587 nm by the difference frequency generation in a periodically-poled li…
Observation of two output light pulses from a partial wavelength converter preserving phase of an input light at a single-photon level
Rikizo Ikuta, Toshiki Kobayashi, Hiroshi Kato +9
We experimentally demonstrate that both a converted and an unconverted light pulses after wavelength conversion with various conversion efficiencies preserve phase information of a…
Universal gates for transforming multipartite entangled Dicke states
Toshiki Kobayashi, Rikizo Ikuta, Sahin Kaya Ozdemir +4
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 Dic…
Non-classical two-photon interference between independent telecom light pulses converted by difference-frequency generation
Rikizo Ikuta, Toshiki Kobayashi, Hiroshi Kato +9
We experimentally demonstrated the Hong-Ou-Mandel (HOM) interference between two photons after visible-to-telecommunication wavelength conversion. In the experiment, we prepared a…