445 citations
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9 papers · 1 filter
Combating entanglement sudden death with non-local quantum-error correction
Isabel Sainz, Gunnar Bjork
We study the possibility of preventing finite-time disentanglement caused by dissipation by making use of "non-local quantum error correction. This is made in comparison of previou…
Causal signal transmission by quantum fields. II. Quantum-statistical response of interacting bosons
L. I. Plimak, S. Stenholm
We analyse nonperturbatively signal transmission patterns in Green's functions of interacting quantum fields. Quantum field theory is re-formulated in terms of the nonlinear quantu…
Causal signal transmission by quantum fields. I. Response of the harmonic oscillator
L. I. Plimak, S. Stenholm
It is shown that response properties of a quantum harmonic oscillator are in essence those of a classical oscillator, and that, paradoxical as it may be, these classical properties…
Robust quantum cryptography with a heralded single-photon source based on the decoy-state method
Qin Wang, Wei Chen, Guilherme Xavier +7
In this paper, we describe a robust quantum cryptography scheme with a heralded single photon source based on the decoy-state method, which has been shown by numerical simulations…
Geometrical approach to mutually unbiased bases
A. B. Klimov, J. L. Romero, G. Bjork +1
We propose a unifying phase-space approach to the construction of mutually unbiased bases for a two-qubit system. It is based on an explicit classification of the geometrical struc…
Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers
Daniel Ljunggren, Maria Tengner
We present a theoretical and experimental investigation of the emission characteristics and the flux of photon pairs generated by spontaneous parametric downconversion in quasi-pha…