Keiichi Edamatsu
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Explore the profile of Keiichi Edamatsu including associated specialties, affiliations and a list of published articles.
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Recent Articles
11.
Baek S, Kaneda F, Ozawa M, Edamatsu K
Sci Rep
. 2013 Jul;
3:2221.
PMID: 23860715
The uncertainty principle formulated by Heisenberg in 1927 describes a trade-off between the error of a measurement of one observable and the disturbance caused on another complementary observable such that...
12.
Kaneda F, Shimizu R, Ishizaka S, Mitsumori Y, Kosaka H, Edamatsu K
Phys Rev Lett
. 2012 Sep;
109(4):040501.
PMID: 23006069
Entanglement is one of the essential resources in quantum information and communication technology (QICT). The entanglement thus far explored and applied to QICT has been pure and distillable entanglement. Yet,...
13.
Ueno W, Kaneda F, Suzuki H, Nagano S, Syouji A, Shimizu R, et al.
Opt Express
. 2012 Mar;
20(5):5508-17.
PMID: 22418356
We proposed and demonstrated a simple but deterministic scheme for generating polarization-entangled photon pairs at telecommunication wavelengths with type-II quasi-phase-matched spontaneous parametric down-conversion (QPM-SPDC) having two poling periods. We fabricated...
14.
Shimizu R, Edamatsu K
Opt Express
. 2009 Sep;
17(19):16385-93.
PMID: 19770852
We report the high-flux and broadband generation of biphotons with controlled frequency entanglement. For the generation of the entangled state consisting of frequency-anticorrelated photons, we use PPMgSLT pumped by a...
15.
Kosaka H, Inagaki T, Rikitake Y, Imamura H, Mitsumori Y, Edamatsu K
Nature
. 2009 Feb;
457(7230):702-5.
PMID: 19194446
Spin is a fundamental property of electrons, with an important role in information storage. For spin-based quantum information technology, preparation and read-out of the electron spin state are essential functions....
16.
17.
Kosaka H, Shigyou H, Mitsumori Y, Rikitake Y, Imamura H, Kutsuwa T, et al.
Phys Rev Lett
. 2008 Mar;
100(9):096602.
PMID: 18352739
We demonstrate that the superposition of light polarization states is coherently transferred to electron spins in a semiconductor quantum well. By using time-resolved Kerr rotation, we observe the initial phase...
18.
Oohata G, Shimizu R, Edamatsu K
Phys Rev Lett
. 2007 May;
98(14):140503.
PMID: 17501255
We have investigated the polarization entanglement between photon pairs generated from a biexciton in a CuCl single crystal via resonant hyperparametric scattering. The pulses of a high repetition pump are...
19.
Edamatsu K, Oohata G, Shimizu R, Itoh T
Nature
. 2004 Sep;
431(7005):167-70.
PMID: 15356626
Entanglement is one of the key features of quantum information and communications technology. The method that has been used most frequently to generate highly entangled pairs of photons is parametric...
20.
Edamatsu K, Shimizu R, Itoh T
Phys Rev Lett
. 2002 Nov;
89(21):213601.
PMID: 12443411
Using a basic Mach-Zehnder interferometer, we demonstrate experimentally the measurement of the photonic de Broglie wavelength of entangled photon pairs (biphotons) generated by spontaneous parametric down-conversion. The observed interference manifests...