42 citations · 331 across the 21 of their papers we have counts for
18 papers · 1 filter
Complex counterpart of variance in quantum measurements for pre- and post-selected systems
Kazuhisa Ogawa, Natsuki Abe, Hirokazu Kobayashi +1
The variance of an observable in a pre-selected quantum system, which is always real and non-negative, appears as an increase in the probe wave packet width in indirect measurement…
Direct measurement of ultrafast temporal wavefunctions
Kazuhisa Ogawa, Takumi Okazaki, Hirokazu Kobayashi +2
The large capacity and robustness of information encoding in the temporal mode of photons is important in quantum information processing, in which characterizing temporal quantum s…
Operational formulation of weak values without probe systems
Kazuhisa Ogawa, Hirokazu Kobayashi, Akihisa Tomita
Weak values are the fundamental values for observables in a pre- and post-selected system. Weak values are typically measured by weak measurement, in which weak values appear in th…
A framework for measuring weak values without weak interactions and its diagrammatic representation
Kazuhisa Ogawa, Osamu Yasuhiko, Hirokazu Kobayashi +2
Weak values are typically obtained experimentally by performing weak measurements, which involve weak interactions between the measured system and a probe. However, the determinati…
Classical reconstruction of interference patterns of position-wavevector-entangled photon pairs by time-reversal method
Kazuhisa Ogawa, Hirokazu Kobayashi, Akihisa Tomita
The quantum interference of entangled photons forms a key phenomenon underlying various quantum-optical technologies. It is known that the quantum interference patterns of entangle…
Quantification of Concurrence via Weak Measurement
Mikko Tukiainen, Hirokazu Kobayashi, Yutaka Shikano
Since entanglement is not an observable per se, measuring its value in practice is a difficult task. Here we propose a protocol for quantifying a particular entanglement measure, n…