Yabushita, Atsushi, Kobayashi, Takayoshi
Using spontaneous parametric down-conversion, photon pairs entangled in frequency and polarization were generated. After frequency resolving the photon pairs, the polarization correlations were...
Spectroscopy by frequency entangled photon pairs (2003)
Yabushita, Atsushi, Kobayashi, Takayoshi
Quantum spectroscopy was performed using the frequency-entangled broadband photon pairs generated by spontaneous parametric down-conversion. An absorptive sample was placed in front of the idler...
Two-photon interference of multimode two-photon pairs with an unbalanced interferometer (2003)
Goto, Hayato, Wang, Haibo, Horikiri, Tomoyuki, Yanagihara, Yasuo, Kobayashi, Takayoshi
Two-photon interference of multimode two-photon pairs produced by an optical parametric oscillator has been observed for the first time with an unbalanced interferometer. The time correlation between...
Observation of an oscillatory correlation function of multimode two-photon pairs (2003)
Goto, Hayato, Yanagihara, Yasuo, Wang, Haibo, Horikiri, Tomoyuki, Kobayashi, Takayoshi
An oscillatory correlation function has been observed by the coincidence counting of multimode two-photon pairs produced with a degenerate optical parametric oscillator far below threshold. The...
Continuous variable teleportation of single photon states (Proceedings version) (2001)
Ide, Toshiki, Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
We investigate the changes to a single photon state caused by the non-maximal entanglement in continuous variable quantum teleportation. It is shown that the teleportation measurement introduces...
Gain tuning and fidelity in continuous variable quantum teleportation (2001)
Ide, Toshiki, Hofmann, Holger F., Furusawa, Akira, Kobayashi, Takayoshi
The fidelity of continuous variable teleportation can be optimized by changing the gain in the modulation of the output field. We discuss the gain dependence of fidelity for coherent, vacuum and one...
Hofmann, Holger F., Ide, Toshiki, Kobayashi, Takayoshi, Furusawa, Akira
We analyze the loss of fidelity in continuous variable teleportation due to non-maximal entanglement. It is shown that the quantum state distortions correspond to the measurement back-action of a...
Continuous variable teleportation of single photon states (2001)
Ide, Toshiki, Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
The properties of continuous variable teleportation of single photon states are investigated. The output state is different from the input state due to the non-maximal entanglement in the EPR beams....
Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
In conventional quantum nondemolition measurements, the interaction between signal and probe preserves the measured variable. Alternatively, it is possible to restore the original value of the...
Information losses in continuous variable quantum teleportation (2001)
Hofmann, Holger F., Ide, Toshiki, Kobayashi, Takayoshi, Furusawa, Akira
It is shown that the information losses due to the limited fidelity of continuous variable quantum teleportation are equivalent to the losses induced by a beam splitter of appropriate reflectivity.
Hofmann, Holger F., Fuji, Takao, Kobayashi, Takayoshi
A pair of coherent femtosecond pulse excitations applied to a molecule with strong electron-phonon coupling creates a coherent superposition of a low momentum and a high momentum wavepacket in the...
Molecular photon echoes as a signature of vibrational cat states (2000)
Hofmann, Holger F., Fuji, Takao, Sugita, Atsushi, Kobayashi, Takayoshi
Quantum interference between two distinct vibrational trajectories induced by two pulse femtosecond excitation in molecules is shown to result in a photon echo, providing direct evidence of the cat...
Quantum jumps in backaction evasion measurements of a light field component (2000)
Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
Backaction evasion measurements of a quadrature component of the light field vacuum necessarily induce quantum jumps in the photon number. The correlation between measurement results and quantum jump...
Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
The original purpose of measurements is to provide us with information about a previously unknown physical property of the system observed. In the Hilbert space formalism of quantum mechanics, this...
Fidelity and information in the quantum teleportation of continuous variables (2000)
Hofmann, Holger F., Ide, Toshiki, Kobayashi, Takayoshi, Furusawa, Akira
Ideally, quantum teleportation should transfer a quantum state without distortion and without providing any information about that state. However, quantum teleportation of continuous electromagnetic...
Nonclassical correlations of photon number and field components in the vacuum state (1999)
Hofmann, Holger F., Kobayashi, Takayoshi, Furusawa, Akira
It is shown that the quantum jumps in the photon number n from zero to one or more photons induced by backaction evasion quantum nondemolition measurements of a quadrature component x of the vacuum...
Kobayashi, Takayoshi, Kajzar, Francois
The Final Proceedings for International Conference on Organic Nonlinear Optics, 9 January 1994 - 13 January 1994. The Final Proceedings for International Conference on Organic Nonlinear Optics, 9...
LO Phonons in CdS(x)Se(1-x) Semiconductor Microcrystallites, (1992)
Kobayashi, Takayoshi, Nomura, Shintaro
It is of interest and importance to study semiconductor microcrystallites as three dimensionally confined system in conjecture with one dimensionally confined quantum well systems. Because the...
IKEDA, SHU-ICHI, HANYU, NORINAO, HONGO, MINORU, YOSHIOKA, JIRO, OGUCHI, HISAO, YANAGISAWA, NOBUO, ...
A clinicopathological study was made on 65 patients from a small area of Nagano Prefecture, Japan, with hereditary generalized amyloidosis with polyneuropathy to clarify the clinical variety of the...
A Short Lived Intermediate in the Photoconversion of Protochlorophyllide to Chlorophyllide a (1981)
Inoue, Yorinao, Kobayashi, Takayoshi, Ogawa, Teruo, Shibata, Kazuo
The transient absorption change for the photoreduction of protochlorophyllide (PChlide) was studied with a solution of extracted PChlide holochrome and with etiolated leaves. The following results...
An official site of the Kobayashi Laboratory, Department of Physics,Graduate School of Science, the University of Tokyo. The laboratory conducts research on ultrafast and nonlinear optical processes,...
Primary Processes in Photolysis of Octopus Rhodopsin
Ohtani, Hiroyuki, Kobayashi, Takayoshi, Tsuda, Motoyuki, Ebrey, Thomas G.
The photolysis of octopus rhodopsin was studied by picosecond time-resolved spectroscopy at physiological temperature (8°C) and by steady-state spectroscopy at very low temperature (10 K). Both...
Branching Photocycle of Sensory Rhodopsin in Halobacterium Halobium
Ohtani, Hiroyuki, Kobayashi, Takayoshi, Tsuda, Motoyuki
Temperature effect of the photocyle of sensory rhodopsin (sR) was studied by nanosecond spectroscopy. Though the formation yield of sRM (sR370) was sharply decreased with temperature, those of sRK...
Primary Processes in Photolysis of Octopus Rhodopsin
Ohtani, Hiroyuki, Kobayashi, Takayoshi, Tsuda, Motoyuki, Ebrey, Thomas G.
The photolysis of octopus rhodopsin was studied by picosecond time-resolved spectroscopy at physiological temperature (8°C) and by steady-state spectroscopy at very low temperature (10 K). Both...
Branching Photocycle of Sensory Rhodopsin in Halobacterium Halobium
Ohtani, Hiroyuki, Kobayashi, Takayoshi, Tsuda, Motoyuki
Temperature effect of the photocyle of sensory rhodopsin (sR) was studied by nanosecond spectroscopy. Though the formation yield of sRM (sR370) was sharply decreased with temperature, those of sRK...
An official site of the Kobayashi Laboratory, Department of Physics,Graduate School of Science, the University of Tokyo. The laboratory conducts research on ultrafast and nonlinear optical processes,...