252 citations · 3.4k across the 59 of their papers we have counts for
49 papers · 1 filter
Stabilizer formalism in linear optics and application to Bell-state discrimination
Tomohiro Yamazaki, Rikizo Ikuta, Takashi Yamamoto
We propose a framework to analyze linear optical circuits based on an analogy with stabilizer formalism in quantum circuits, which provides efficiently computable formulas related…
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…
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…
Robust entanglement distribution via telecom fibre assisted by an asynchronous counter-propagating laser light
Koichiro Miyanishi, Yoshiaki Tsujimoto, Rikizo Ikuta +7
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 (…
Frequency-multiplexed photon pairs over 1000 modes from a quadratic nonlinear optical waveguide resonator with a singly-resonant configuration
Rikizo Ikuta, Ryoya Tani, Masahiro Ishizaki +5
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…
Quantum key distribution with setting-choice-independently correlated light sources
Akihiro Mizutani, Go Kato, Koji Azuma +6
Despite the enormous theoretical and experimental progress made so far in quantum key distribution (QKD), the security of most existing QKD implementations is not rigorously establ…
Long-distance single photon transmission from a trapped ion via quantum frequency conversion
Thomas Walker, Koichiro Miyanishi, Rikizo Ikuta +7
Trapped atomic ions are ideal single photon emitters with long lived internal states which can be entangled with emitted photons. Coupling the ion to an optical cavity enables effi…
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…
High-fidelity entanglement swapping and generation of three-qubit GHZ state using asynchronous telecom photon pair sources
Yoshiaki Tsujimoto, Motoki Tanaka, Nobuo Iwasaki +7
We experimentally demonstrate a high-fidelity entanglement swapping and a generation of the Greenberger-Horne-Zeilinger~(GHZ) state using polarization-entangled photon pairs at tel…
A high visibility Hong-Ou-Mandel interference via a time-resolved coincidence measurement
Yoshiaki Tsujimoto, Yukihiro Sugiura, Motoki Tanaka +9
We report on the observation of a high visibility Hong-Ou-Mandel interference of two heralded photons emitted from a spontaneous parametric down conversion~(SPDC) pumped by continu…
Experimental demonstration of robust entanglement distribution over reciprocal noisy channels assisted by a counter-propagating classical reference light
Rikizo Ikuta, Shota Nozaki, Takashi Yamamoto +2
We experimentally demonstrate a proposal [Phys. Rev. A 87, 052325 (2013)] of a scheme for robust distribution of polarization entangled photon pairs over collective noisy channels…
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…
Security of quantum key distribution with non-I.I.D. light sources
Yuichi Nagamatsu, Akihiro Mizutani, Rikizo Ikuta +3
Although quantum key distribution (QKD) is theoretically secure, there is a gap between the theory and practice. In fact, real-life QKD may not be secure because component devices…
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…
Distillation of photon entanglement using a plasmonic metamaterial
Motoki Asano, Muriel Bechu, Mark Tame +7
Plasmonics is a rapidly emerging platform for quantum state engineering with the potential for building ultra-compact and hybrid optoelectronic devices. Recent experiments have sho…
Blind quantum computation over a collective-noise channel
Yuki Takeuchi, Keisuke Fujii, Rikizo Ikuta +2
Blind quantum computation (BQC) allows a client (Alice), who only possesses relatively poor quantum devices, to delegate universal quantum computation to a server (Bob) in such a w…
Extracting an entangled photon pair from collectively decohered pairs at a telecommunication wavelength
Yoshiaki Tsujimoto, Yukihiro Sugiura, Makoto Ando +5
We experimentally demonstrated entanglement extraction scheme by using photons at the telecommunication band for optical-fiber-based quantum communications. We generated two pairs…
Measurement-device-independent quantum key distribution for Scarani-Acin-Ribordy-Gisin 04 protocol
Akihiro Mizutani, Kiyoshi Tamaki, Rikizo Ikuta +2
The measurement-device-independent quantum key distribution (MDI QKD) was proposed to make BB84 completely free from any side-channel in detectors. Like in prepare & measure QKD, t…
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…
Robustness of quantum communication based on a decoherence-free subspace using a counter-propagating weak coherent light pulse
Hidetoshi Kumagai, Takashi Yamamoto, Masato Koashi +1
We study distribution schemes for a polarization entangled photon pair based on a decoherence-free subspace over lossy quantum channels and propose an efficient scheme that is robu…
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…