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5 papers · 2 filters
Measurement of spatial qubits
G. Lima, F. A. Torres-Ruiz, L. Neves +3
In this paper we study the state determination for composite systems of two spatial qubits. We show, theoretically, that one can use the technique of quantum tomography to reconstr…
Generating mixtures of spatial qubits
G. Lima, F. A. Torres-Ruiz, L. Neves +3
In a recent letter [Phys. Rev. Lett. 94, 100501 (2005)], we presented a scheme for generating pure entangled states of spatial qudits (-dimensional quantum systems) by using the…
Entanglement of distant atoms by projective measurement: The role of detection efficiency
Stefano Zippilli, Georgina A. Olivares-Renteria, Giovanna Morigi +3
We assess proposals for entangling two distant atoms by measurement of emitted photons, analyzing how their performance depends on the photon detection efficiency. We consider sche…
Optimal quantum state reconstruction for cold trapped ions
A. B. Klimov, A. Fernández, C. Muñoz +1
We study the physical implementation of an optimal tomographic reconstruction scheme for the case of determining the state of a multi-qubit system, where trapped ions are used for…
Quantum phase transitions in an effective Hamiltonian: fast and slow systems
Isabel Sainz, Andrei B. Klimov, Luis Roa
An effective Hamiltonian describing interaction between generic "fast" and a "slow" systems is obtained in the strong interaction limit. The result is applied for studying the effe…