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12 papers · 1 filter
Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots
M. Pioro-Ladriere, Y. Tokura, T. Obata +2
A lateral quantum dot design for coherent electrical manipulation of a two-level spin-charge system is presented. Two micron-size permanent magnets integrated to high-frequency ele…
Quantum non-demolition measurement of a superconducting two-level system
A. Lupascu, S. Saito, T. Picot +3
In quantum mechanics, the process of measurement is a subtle interplay between extraction of information and disturbance of the state of the quantum system. A quantum non-demolitio…
Tunnelling spectroscopy of the interface between Sr2RuO4 and a single Ru micro-inclusion in eutectic crystals
Hiroshi Yaguchi, Keiichi Takizawa, Minoru Kawamura +6
The understanding of the zero bias conductance peak (ZBCP) in the tunnelling spectra of S/N junctions involving d-wave cuprate superconductors has been important in the determinati…
Dephasing of a superconducting flux qubit
K. Kakuyanagi, T. Meno, S. Saito +5
In order to gain a better understanding of the origin of decoherence in superconducting flux qubits, we have measured the magnetic field dependence of the characteristic energy rel…
100 km secure differential phase shift quantum key distribution with low jitter up-conversion detectors
Eleni Diamanti, Hiroki Takesue, Carsten Langrock +2
We present a quantum key distribution experiment in which keys that were secure against all individual eavesdropping attacks allowed by quantum mechanics were distributed over 100…
Unconditional security of the Bennett 1992 quantum key-distribution scheme with strong reference pulse
Kiyoshi Tamaki, Norbert Lütkenhaus, Masato Koashi +1
We prove the unconditional security of the original Bennett 1992 protocol with strong reference pulse. We show that we may place a projection onto suitably defined qubit spaces bef…