［ D 02 ］

Light-based multi-qubit quantum control

→Description of Research Areas D02

Practical quantum key distribution protocol without monitoring signal disturbance
T. Sasaki, Y. Yamamoto, M. Koashi
Nature Vol. 509, 475 (2014)

Frequency down-conversion of 637 nm light to the telecommunication band for non-classical light emitted from NV centers in diamond
R. Ikuta, T. Kobayashi, S. Yasui, S. Miki, T. Yamashita, H. Terai, M. Fujiwara, T. Yamamoto, M. Koashi, M. Sasaki, Z. Wang, N. Imoto
Optics Express Vol. 22, 11205 (2014)

Universal gates for transforming multipartite entangled Dicke states
T. Kobayashi, R. Ikuta, S. K. Ozdemir, M. Tame, T. Yamamoto, M. Koashi, N. Imoto
New Journal of Physics Vol. 16, 023005:1-9 (2014)

Observation of two output light pulses from a partial wavelength converter preserving phase of an input light at a single-photon level
R. Ikuta, T. Kobayashi, H. Kato, S. Miki, T. Yamashita, H. Terai, M. Fujiwara, T. Yamamoto, M. Koashi, M. Sasaki, Z. Wang, N. Imoto
Optics Express Vol. 21, 27865 (2013)

Nonclassical two-photon interference between independent telecommunication light pulses converted by difference-frequency generation
R. Ikuta, T. Kobayashi, H. Kato, S. Miki, T. Yamashita, H. Terai, M. Fujiwara, T. Yamamoto, M. Koashi, M. Sasaki, Z. Wang, N. Imoto
Phys. Rev. A 88, 042317 (2013)

Robustness of quantum communication based on a decoherence-free subspace using a counter-propagating weak coherent light pulse
H. Kumagai, T. Yamamoto, M. Koashi, N. Imoto
Phys Rev. A 87, 052325 (2013)

Fundamental limit to qubit control with coherent field
K. Igeta, N. Imoto, M. Koashi
Phys. Rev. A 87, 022321 (2013)

High-fidelity conversion of photonic quantum information to telecommunication wavelength with superconducting single-photon detectors
R. Ikuta, H. Kato, Y. Kusaka, S. Miki, T. Yamashita, H. Terai, M. Fujiwara, T. Yamamoto, M. Koashi, M. Sasaki, Z. Wang, N. Imoto
Phys. Rev. A 87, 010301(R) (2013)

Quantum repeaters and computation by a single module: Remote nondestructive parity measurement
K. Azuma, H. Takeda, M. Koashi, N. Imoto
Phys. Rev. A 85, 062309 (2012)

Wide-band quantum interface for visible-to-telecommunication wavelength conversion
R. Ikuta, Y. Kusaka, T. Kitano, H. Kato, T. Yamamoto, M. Koashi, N. Imoto
Nature Communications, 2:537 (2011)

An optical fusion gate for W-states
S.K. Ozdemir, E. Matsunaga, T. Tashima, T. Yamamoto, M. Koashi, N. Imoto
New J. Phys., 13, 103003 (2011)

Efficient decoherence-free entanglement distribution over lossy quantum channels
R. Ikuta, Y. Ono, T. Tashima, T. Yamamoto, M. Koashi, N. Imoto
Phys. Rev. Lett., 106, 110503 (2011)

Optimal local expansion of W states using linear optics and Fock states
R. Ikuta, T. Tashima, T. Yamamoto, M. Koashi, N. Imoto
Phys. Rev. A 83, 012314 (2011)

Demonstration of Local Expansion Toward Large-Scale Entangled Webs
T. Tashima, T. Kitano, S.K. Ozdemir, T. Yamamoto, M. Koashi, N. Imoto
Phys. Rev. Lett., 105, 210503 (2010)

Tight bound on coherent-state-based entanglement generation over lossy channels
K. Azuma, N. Sota, M. Koashi, N. Imoto
Phys. Rev. A 81, 022325 (2010)

Optimal entanglement generation for efficient hybrid quantum repeaters
K. Azuma, N. Sota, R. Namiki, S.K. Ozdemir, T. Yamamoto, M. Koashi, N. Imoto
Phys. Rev. A 80, 060303(R) (2009)

Boosting up quantum key distribution by learning statistics of practical single-photon sourceｓ
Y. Adachi, T. Yamamoto, M. Koashi, N. Imoto
New J. Phys., 11, 113033 (2009)