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4 papers · 1 filter
Quantum cryptography using balanced homodyne detection
T. Hirano, T. Konishi, R. Namiki
We report an experimental quantum key distribution that utilizes balanced homodyne detection, instead of photon counting, to detect weak pulses of coherent light. Although our sche…
Detecting Gapless Excitations above Ferromagnetic Domain Walls
Tohru Koma, Masanori Yamanaka
In a two or three dimensional ferromagnetic XXZ model, a low energy excitation mode above a magnetic domain wall is gapless, whereas all of the usual spin wave excitations moving a…
Resistance Jumps and Hysteresis in Ferromagnetic Wires
Tohru Koma, Masanori Yamanaka
A phenomenological approach based on the principle of minimum heat generation is proposed for understanding experiments for metallic wires with a ferromagnetic domain wall controll…
Self-Consistent Tensor Product Variational Approximation for 3D Classical Models
T. Nishino, K. Okunishi, Y. Hieida +2
We propose a numerical variational method for three-dimensional (3D) classical lattice models. We construct the variational state as a product of local tensors, and improve it by u…