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Browsing by Author "Huelga, S.F."
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Atomic-cascade experiment with detection of the recoil atom
Huelga, S.F.; Ferrero, M.; Santos, E. (1994)Bell's inequalities cannot be violated in atomic-cascade experiments, even with ideal apparatus, due to the three-body character of the atomic decay. Here we propose a new experiment that would block this loophole by means ... -
The benefit of doing things slowly : employing dissipation for the robust creation of entanglement between ions in spatially separate cavities
Plenio, M.B.; Browne, D.E.; Huelga, S.F. (SPIE, 2003)We present protocol that allows the generation of a maximallyentangled state between individual atoms held in spatiallyseparate cavities. Under ideal conditions, the scheme isdeterministic. In a realistic setting, when the ... -
Cavity-loss-induced generation of entangled atoms
Plenio, M.B.; Huelga, S.F.; Beige, A.; Knight, P.L. (1999)We discuss the generation of entangled states of two two-level atoms inside an optical resonator. When the cavity decay is continuously monitored, the absence of photon-counts is associated with the presence of an atomic ... -
A class of Symmetric controlled quantum operations
Steuernagel, O.; Huelga, S.F. (2001)Certain quantum gates, such as the controlled-NOT gate, are symmetric in terms of the operation of the control system upon the target system and vice versa. However, no operational criteria yet exist for establishing whether ... -
Classical simulability, entanglement breaking and quantum computation threshold
Virmani, S.; Huelga, S.F.; Plenio, M.B. (2005) -
Coherent manipulation of two dipole-dipole interacting ions
Beige, A.; Huelga, S.F.; Knight, P.L.; Plenio, M.B.; Thomson, R.C. (2000) -
Control-limited perfect state transfer, quantum stochastic resonance, and many-body entangling gate in imperfect qubit registers
Di Franco, C.; Paternostro, M.; Tsomokos, D.I.; Huelga, S.F. (2008)We propose a protocol for perfect quantum state transfer that is resilient to a broad class of realistic experimental imperfections, including noise sources that could be modeled either as independent Markovian baths or ... -
Dephasing-assisted transport: quantum networks and biomolecules
Plenio, M.B.; Huelga, S.F. (2008)Transport phenomena are fundamental in physics. They allow for information and energy to be exchanged between individual constituents of communication systems, networks or even biological entities. Environmental noise will ... -
Distributed quantum computation over noisy channels
Cirac, J.; Ekert, A.K.; Huelga, S.F.; Macchiavello, C. (1999)We analyse the use of entangled states to perform quantum computations non locally among distant nodes in a quantum network. The complexity associated with the generation of multiparticle entangled states is quantified in ... -
Entangled Light From White Noise
Plenio, M.B.; Huelga, S.F. (2002) -
Entanglement and entangling power of the dynamics in light-harvesting complexes
Caruso, F.; Chin, A.W.; Datta, A.; Huelga, S.F.; Plenio, M.B. (2010)We study the evolution of quantum entanglement during exciton energy transfer (EET) in a network model of the Fenna-Matthews-Olson (FMO) complex, a biological pigment-protein complex involved in the early steps of ... -
Entanglement and Non-Markovianity of Quantum Evolutions
Rivas, A.; Huelga, S.F.; Plenio, M.B. (2010)We address the problem of quantifying the non-Markovian character of quantum time evolutions of general systems in contact with an environment. We introduce two different measures of non-Markovianity that exploit the ... -
Entanglement dynamics in chains of qubits with noise and disorder
Tsomokos, D.I.; Hartmann, M.J.; Huelga, S.F.; Plenio, M.B. (2007) -
Entanglement in frequency standards and quantum information theory
Huelga, S.F.; Knight, P.L.; Macchiavello, C.; Plenio, M.B.; Vedral, V. (1998)Entanglement is a key property of quantum information theory. Here we describe ways to quantify the amount of entanglement.We point out the statistical interpretation of these entanglement measures and some connections ... -
Entangling atoms and ions in dissipative environments
Beige, A.; Braun, D.; Bose, S.; Huelga, S.F.; Knight, P.L.; Plenio, M.B.; Vedral, V. (2000) -
Highly efficient energy excitation transfer in light-harvesting complexes : the fundamental role of noise-assisted transport
Caruso, F.; Chin, A.W.; Datta, A.; Huelga, S.F.; Plenio, M.B. (2009)Excitation transfer through interacting systems plays an important role in many areas of physics, chemistry, and biology. The uncontrollable interaction of the transmission network with a noisy environment is usually assumed ... -
Improvement of frequency standards with quantum entanglement
Huelga, S.F.; Macchiavello, C.; Pellizzari, T.; Ekert, A.K.; Plenio, M.B.; Cirac, J. (1997)The optimal precision of frequency measurements in the presence of decoherence is discussed. We analyse different preparations of n two-level systems as well as different measurements procedures. We show that standard ... -
Loophole-free test of the Bell inequality
Huelga, S.F.; Ferrero, M.; Santos, E. (1995)An atomic cascade experiment is proposed that includes the detection of a recoil atom after the emission of two photons. This would permit testing of the Bell inequality without the need for additional assumptions, provided ... -
Measuring the entanglement of bipartite pure states
Sancho, J.M.G.; Huelga, S.F. (2000) -
Noise-assisted energy transfer in quantum networks and light-harvesting complexes
Chin, A.W.; Datta, A.; Caruso, F.; Huelga, S.F.; Plenio, M.B. (2010)We provide physically intuitive mechanisms for the effect of noise on excitation energy transfer (EET) in networks. Using these mechanisms of dephasing-assisted transport (DAT) in a hybrid basis of both excitons and sites, ...