110 citations · 275 across the 9 of their papers we have counts for
9 papers
Photon-arrival detector with a controlled phase flip operation between a photon and a V-type atomic system
Kunihiro Kojima, Akihisa Tomita
We propose a photon-arrival detector (PAD), which detects the arrival of a signal photon and simultaneously projects the signal input state to a single photon state, with an atom-c…
Influence of pure-dephasing by phonons on exciton-photon interfaces: Quantum microscopic theory
Kunihiro Kojima, Akihisa Tomita
We have developed a full quantum microscopic theory to analyze the time evolution of transversal and longitudinal components of an exciton-single photon system coupled to bulk acou…
Quantum non-demolition measurement of photon-arrival using an atom-cavity system
Kunihiro Kojima, Akihisa Tomita
A simple and efficient quantum non-demolition measurement (QND) scheme is proposed in which the arrival of a signal photon is detected without affecting the qubit state. The propos…
Efficiencies for the single mode operation of a quantum optical nonlinear shift gate
Kunihiro Kojima, Holger F. Hofmann, Shigeki Takeuchi +1
We investigate the single mode operation of a quantum optical nonlinear πphase shift gate implemented by a single two-level atom in one-dimensional free space. Since the single mod…
A study on the shape of two-photon wavefunctions after the nonlinear interaction with a one-dimensional atom
Kunihiro Kojima, Holger F. Hofmann, Shigeki Takeuchi +1
We study the interaction of Gaussian one- and two-photon pulses with a single two-level atom based on a one-dimensional model of pulse propagation to and from the atom. The charact…
Entanglement and four wave mixing effects in the dissipation free nonlinear interaction of two photons at a single atom
Holger F. Hofmann, Kunihiro Kojima, Shigeki Takeuchi +1
We investigate the nonlinear interaction between two photons in a single input pulse at an atomic two level nonlinearity. A one dimensional model for the propagation of light to an…