Distribution of continuous-variable entanglement by separable Gaussian states (2008)
Mišta, Ladislav, Jr., Korolkova, Natalia
Entangling two systems at distant locations using a {\it separable} mediating ancilla is a counterintuitive phenomenon proposed for qubits by T. Cubitt {\it et al}. [Phys. Rev. Lett. {\bf 91}, 037902...
Weak Measurements with Entangled Probes (2008)
Menzies, David, Korolkova, Natalia
Encoding the imaginary part of a weak value onto an initially entangled probe can modify its entanglement content - provided the probe observable can distinguish between states of different...
Cross-Kerr effective Hamiltonian for a non-resonant four-level atom (2007)
Sinclair, Gary F., Korolkova, Natalia
We derive a cross-Kerr type effective Hamiltonian for the four-level atom interacting with three electromagnetic fields in the N-configuration. When the atom has relaxed into the ground state a...
Highly non-Gaussian states created via cross-Kerr nonlinearity (2007)
Tyc, Tomas, Korolkova, Natalia
We propose a feasible scheme for generation of strongly non-Gaussian states using the cross-Kerr nonlinearity. The resultant states are highly non-classical states of electromagnetic field and...
Weak Values and Continuous-Variable Entanglement Concentration (2007)
Menzies, David, Korolkova, Natalia
We demonstrate a general weak measurement model which allows Gaussian preserving entanglement concentration of the two mode squeezed vacuum. The power of this simple and elegant protocol is through...
Cross-Kerr interaction in a four-level atomic system (2007)
Sinclair, Gary F., Korolkova, Natalia
We derive the form of the cross-Kerr interaction in a four-level atomic system in the N-configuration. We use time-independent perturbation theory to calculate the eigenenergies and eigenstates of...
Procrustean entanglement concentration of continuous variable states of light (2006)
Menzies, David, Korolkova, Natalia
We propose a Procrustean entanglement concentration scheme for continuous variable states inspired by the scheme proposed in Fiurasek et. al. Phys. Rev. A 67, 022304, (2003). We show that the...
Continuous variable quantum key distribution using polarization encoding and post selection (2004)
Lorenz, Stefan, Korolkova, Natalia, Leuchs, Gerd
We present an experimental demonstration of a quantum key distribution protocol using coherent polarization states. Post selection is used to ensure a low error rate and security against beam...
Glöckl, Oliver, Lorenz, Stefan, Marquardt, Christoph, Heersink, Joel, Brownnutt, Michel, Silberhorn, Christine, ...
We present a protocol for performing entanglement swapping with intense pulsed beams. In a first step, the generation of amplitude correlations between two systems that have never interacted directly...
Polarization squeezing and continuous-variable polarization entanglement (2001)
Korolkova, Natalia, Leuchs, Gerd, Loudon, Rodney, Ralph, Timothy C., Silberhorn, Christine
The Stokes-parameter operators and the associated Poincare sphere, which describe the quantum-optical polarization properties of light, are defined and their basic properties are reviewed. The...
Time evolution of a quantum soliton in a Kerr medium (2001)
Korolkova, Natalia, Loudon, Rodney, Gardavsky, Gerlinde, Hamilton, Murray Wayne, Leuchs, Gerd
The Q-function of the quantum soliton in a fibre is derived in a new form suitable for the assessment of the possibilities for experimental observations of specific quantum-soliton effects. The...
Time evolution of a quantum soliton in a Kerr medium (2001)
Korolkova, Natalia, Loudon, Rodney, Gardavsky, Gerlinde, Hamilton, Murray Wayne, Leuchs, Gerd
The Q-function of the quantum soliton in a fibre is derived in a new form suitable for the assessment of the possibilities for experimental observations of specific quantum-soliton effects. The...