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Fundamental limit to Qubit Control with Coherent Field
Kazuhiro Igeta, Nobuyuki Imoto, Masato Koashi
The ultimate accuracy as regards controlling a qubit with a coherent field is studied in terms of degradation of the fidelity by employing a fully quantum mechanical treatment. Whi…
Unconditional security of coherent-state-based differential phase shift quantum key distribution protocol with block-wise phase randomization
Kiyoshi Tamaki, Masato Koashi, Go Kato
We prove the unconditional security of coherent-state-based differential phase shift quantum key distribution protocol (DPSQKD) with block-wise phase randomization. Our proof is ba…
High-fidelity conversion of photonic quantum information to telecommunication wavelength with superconducting single-photon detectors
Rikizo Ikuta, Hiroshi Kato, Yoshiaki Kusaka +9
We experimentally demonstrate a high-fidelity visible-to-telecommunication wavelength conversion of a photon by using a solid-state-based difference frequency generation. In the ex…
A distributed architecture for scalable quantum computation with realistically noisy devices
Keisuke Fujii, Takashi Yamamoto, Masato Koashi +1
Tremendous efforts have been paid for realization of fault-tolerant quantum computation so far. However, preexisting fault-tolerant schemes assume that a lot of qubits live togethe…