315 citations
- Japan Science and Technology AgencyJP5 papers
- RIKENJP2 papers
- Tohoku UniversityJP2 papers
- VTT Technical Research Centre of FinlandFI2 papers
- Delft University of TechnologyNL1 paper
- Imperial College LondonGB1 paper
- Institute for Molecular ScienceJP1 paper
- Kobe UniversityJP1 paper
- London Institute for Mathematical SciencesGB1 paper
- RIKEN Center for Emergent Matter ScienceJP1 paper
- The University of OsakaJP1 paper
- University of MichiganUS1 paper
7 papers · 1 filter
High-efficiency single photon detector combined with an ultra-small APD module and a self-training discriminator for high-speed quantum cryptosystems
Seigo Takahashi, Akio Tajima, Akihisa Tomita
A single-photon avalanche detector (SPAD) for high-speed quantum-key generation has successfully been developed. It has the highest photon detection repetition frequency and the lo…
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…
Bound entanglement provides convertibility of pure entangled states
Satoshi Ishizaka
I show that two distant parties can transform pure entangled states to arbitrary pure states by stochastic local operations and classical communication (SLOCC) at the single copy l…
Measured Quantum Fourier Transform of 1024 Qubits on Fiber Optics
Akihisa Tomita, Kazuo Nakamura
Quantum Fourier transform (QFT) is a key function to realize quantum computers. A QFT followed by measurement was demonstrated on a simple circuit based on fiber-optics. The QFT wa…
Binegativity and geometry of entangled states in two qubits
Satoshi Ishizaka
We prove that the binegativity is always positive for any two-qubit state. As a result, as suggested by the previous works, the asymptotic relative entropy of entanglement in two q…
Majorization criterion for distillability of a bipartite quantum state
Tohya Hiroshima
Bipartite quantum states are classified into three categories: separable states, bound entangled states, and free entangled states. It is of great importance to characterize these…