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25 papers · 2 filters
Multi-particle entanglement manipulation under positive partial transpose preserving operations
Satoshi Ishizaka, Martin B. Plenio
We consider the transformation of multi-partite states in the single copy setting under positive-partial-transpose-preserving operations (PPT-operations) and obtain both qualitativ…
Efficient Quantum Algorithms for the Hidden Subgroup Problem over a Class of Semi-direct Product Groups
Yoshifumi Inui, Francois Le Gall
In this paper, we consider the hidden subgroup problem (HSP) over the class of semi-direct product groups , for p and q prime. We first present…
Drastic effects of damping mechanisms on the third-order optical nonlinearity
Kazuki Koshino, Hajime Ishihara
We have investigated the optical response of superradiant atoms, which undergoes three different damping mechanisms: radiative dissipation (), dephasing (), and nonradiat…
Theory of multiwave mixing and decoherence control in qubit array system
M. Sasaki, A. Hasegawa, J. I. Hayase +2
We develop a theory to analyze the decoherence effect in a charged qubit array system with photon echo signals in the multiwave mixing configuration. We present how the decoherence…
A decoy-state protocol for quantum cryptography with 4 intensities of coherent states
Xiang-Bin Wang
In order to beat any type of photon-number-splitting attack, we propose a protocol for quantum key distributoin (QKD) using 4 different intensities of pulses. They are vacuum and c…
Spin Squeezing via One-Axis Twisting with Coherent Light
M. Takeuchi, S. Ichihara, T. Takano +3
We propose a new method of spin squeezing of atomic spin, based on the interactions between atoms and off-resonant light which are known as paramagnetic Faraday rotation and fictit…