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11 papers · 2 filters
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…
Sequential measurements of non-commuting observables with quantum controlled interactions
Holger F. Hofmann
The origin of non-classical correlations is difficult to identify since the uncertainty principle requires that information obtained about one observable invariably results in the…
Direct observation of temporal coherence by weak projective measurements of photon arrival time
Holger F. Hofmann, Changliang Ren
We show that a weak projective measurement of photon arrival time can be realized by controllable two photon interferences with photons from short-time reference pulses at a polari…
Discrete Fourier-based Correlations for Entanglement Detection
Ryo Namiki, Yuuki Tokunaga
We introduce two forms of correlations on two -level (qudit) systems for entanglement detection. The correlations can be measured via experimentally tractable two local measurem…
Violation of Leggett-Garg inequalities in quantum measurements with variable resolution and back-action
Yutaro Suzuki, Masataka Iinuma, Holger F. Hofmann
Quantum mechanics violates Leggett-Garg inequalities because the operator formalism predicts correlations between different spin components that would correspond to negative joint…
Novel symmetry-broken phase in a driven cavity system in the thermodynamic limit
Tatsuhiko Shirai, Takashi Mori, Seiji Miyashita
We study non-equilibrium stationary states of a cavity system consisting of many atoms interacting with a quantized cavity field mode, under a driving field in a dissipative enviro…