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17 papers · 2 filters
Weak measurement of photon polarization by back-action induced path interference
Masataka Iinuma, Yutaro Suzuki, Gen Taguchi +2
The essential feature of weak measurements on quantum systems is the reduction of measurement back-action to negligible levels. To observe the non-classical features of weak measur…
High-visibility nonclassical interference between pure heralded single photons and weak coherent photons
Rui-Bo Jin, Jun Zhang, Ryosuke Shimizu +4
We present an experiment of nonclassical interference between a pure heralded single-photon state and a weak coherent state. Our experiment is the first to demonstrate that spectra…
Approach to equilbrium in nano-scale systems at finite temperatur
Fengping Jin, Hans De Raedt, Shengjun Yuan +3
We study the time evolution of the reduced density matrix of a system of spin-1/2 particles interacting with an environment of spin-1/2 particles. The initial state of the composit…
Uncertainty Relation Revisited from Quantum Estimation Theory
Yu Watanabe, Takahiro Sagawa, Masahito Ueda
By invoking quantum estimation theory we formulate bounds of errors in quantum measurement for arbitrary quantum states and observables in a finite-dimensional Hilbert space. We pr…
Macroscopic quantum tunneling in multigap superconducting Josephson junctions: Escape rate enhancement via quantum fluctuations of Josephson-Leggett mode
Yukihiro Ota, Masahiko Machida, Tomio Koyama
We theoretically study the macroscopic quantum tunneling (MQT) in a hetero Josephson junction formed by a conventional single-gap superconductor and a multi-gap one such as ${MgB}_…
Entanglement-assisted quantum turbo codes
Mark M. Wilde, Min-Hsiu Hsieh, Zunaira Babar
An unexpected breakdown in the existing theory of quantum serial turbo coding is that a quantum convolutional encoder cannot simultaneously be recursive and non-catastrophic. These…