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11 papers · 1 filter
Quantum-classical correspondence and nonclassical states generation in dissipative quantum optical systems
Kirill N. Alekseev, Natasha V. Alekseeva, Jan Perina
We develop a semiclassical method for the determination of the nonlinear dynamics of dissipative quantum optical systems in the limit of large number of photons N, based on the 1/N…
Analogy between optimal spin estimation and interferometry
Z. Hradil, M. Dusek
Scheme for optimal spin state estimation is considered in analogy with phase detection in interferometry. Recently reported coherent measurements yielding the average fidelity (N+1…
Quantum Zeno effect in a probed downconversion process
J. Rehacek, J. Perina, P. Facchi +2
The distorsion of a spontaneous downconvertion process caused by an auxiliary mode coupled to the idler wave is analyzed. In general, a strong coupling with the auxiliary mode tend…
Testing operational phase concepts in quantum optics
J. Rehacek, Z. Hradil, M. Dusek +2
An experimental comparison of several operational phase concepts is presented. In particular, it is shown that statistically motivated evaluation of experimental data may lead to a…
Unambiguous state discrimination in quantum cryptography with weak coherent states
Miloslav Dusek, Mika Jahma, Norbert Lütkenhaus
The use of linearly independent signal states in realistic implementations of quantum key distribution (QKD) enables an eavesdropper to perform unambiguous state discrimination. We…
Kinks in the discrete sine-Gordon model with Kac-Baker long-range interactions
Serge F. Mingaleev, Yuri B. Gaididei, Eva Majernikova +1
We study effects of Kac-Baker long-range dispersive interaction (LRI) between particles on kink properties in the discrete sine-Gordon model. We show that the kink width increases…