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- The University of TokyoJP46 papers
- Japan Science and Technology AgencyJP38 papers
- RIKENJP37 papers
- National Institute of Advanced Industrial Science and TechnologyJP18 papers
- RIKEN Center for Emergent Matter ScienceJP18 papers
- Massachusetts Institute of TechnologyUS17 papers
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- MIT Lincoln LaboratoryUS11 papers
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15 papers · 1 filter
Quantum oscillations in two coupled charge qubits
Yu. A. Pashkin, T. Yamamoto, O. Astafiev +3
Despite an apparent progress in implementing individual solid-state qubits, there have been no experimental reports so far on multi-bit gates required for building a real quantum c…
Local moment formation in quantum point contacts
Kenji Hirose, Yigal Meir, Ned S. Wingreen
Spin-density-functional theory of quantum point contacts (QPCs) reveals the formation of a local moment with a net of one electron spin in the vicinity of the point contact - suppo…
Experimental investigation of pulsed entangled photons and photonic quantum channels
Yoshihiro Nambu, Koji. Usami, Akihisa Tomita +5
The development of key devices and systems in quantum information technology, such as entangled particle sources, quantum gates and quantum cryptographic systems, requires a reliab…
Systematic Design of Antireflection Coating for Semi-infinite One-dimensional Photonic Crystals Using Bloch Wave Expansion
Jun Ushida, Masatoshi Tokushima, Masayuki Shirane +1
We present a systematic method for designing a perfect antireflection coating (ARC) for a semi-infinite one-dimensional (1D) photonic crystal (PC) with an arbitrary unit cell. We u…
A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound
Koji Usami, Yoshihiro Nambu, Yoshiyuki Tsuda +2
We experimentally analyzed the statistical errors in quantum-state estimation and examined whether their lower bound, which is derived from the Cramer-Rao inequality, can be truly…
Generation of pulsed polarization entangled photon pair via a space cascaded two-crystal geometry
Bao-Sen Shi, Akihisa Tomita
The generation of pulsed polarization entangled photon pair has been realized using type-I phase matching in the spontaneous parametirc downconversion process in a space cascaded t…