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17 papers · 2 filters
Unified View of Quantum and Classical Correlations
Kavan Modi, Tomasz Paterek, Wonmin Son +2
We discuss the problem of the separation of total correlations in a given quantum state into entanglement, dissonance, and classical correlations using the concept of relative entr…
Extreme nonlocality with one photon
Libby Heaney, Adan Cabello, Marcelo F. Santos +1
Quantum nonlocality is typically assigned to systems of two or more well separated particles, but nonlocality can also exist in systems consisting of just a single particle, when o…
Quantum physics meets biology
Markus Arndt, Thomas Juffmann, Vlatko Vedral
Quantum physics and biology have long been regarded as unrelated disciplines, describing nature at the inanimate microlevel on the one hand and living species on the other hand. Ov…
Nested Quantum Error Correction Codes
Zhuo Wang, Kai Sun, Hen Fan +1
The theory of quantum error correction was established more than a decade ago as the primary tool for fighting decoherence in quantum information processing. Although great progres…
The work value of information
Oscar C. O. Dahlsten, Renato Renner, Elisabeth Rieper +1
We present quantitative relations between work and information that are valid both for finite sized and internally correlated systems as well in the thermodynamical limit. We sugge…
Entanglement at the quantum phase transition in a harmonic lattice
Elisabeth Rieper, Janet Anders, Vlatko Vedral
The entanglement properties of the phase transition in a two dimensional harmonic lattice, similar to the one observed in recent ion trap experiments, are discussed both, for finit…
Natural mode entanglement as a resource for quantum communication
Libby Heaney, Vlatko Vedral
Natural particle-number entanglement resides between spatial modes in coherent ultra-cold atomic gases. However, operations on the modes are restricted by a superselection rule tha…
Detecting Entanglement with Jarzynski's Equality
Jenny Hide, Vlatko Vedral
We present a method for detecting the entanglement of a state using non-equilibrium processes. A comparison of relative entropies allows us to construct an entanglement witness. Th…
The elusive source of quantum effectiveness
Vlatko Vedral
We discuss two qualities of quantum systems: various correlations existing between their subsystems and the distingushability of different quantum states. This is then applied to a…
Effect of entanglement on geometric phase for multi-qubit states
Mark S. Williamson, Vlatko Vedral
When a multi-qubit state evolves under local unitaries it may obtain a geometric phase, a feature dependent on the geometry of the state's projective Hilbert space. A correction te…
Sustained Quantum Coherence and Entanglement in the Avian Compass
Erik Gauger, Elisabeth Rieper, John J. L. Morton +2
In artificial systems, quantum superposition and entanglement typically decay rapidly unless cryogenic temperatures are used. Could life have evolved to exploit such delicate pheno…
On the quantum criticality in the ground and the thermal states of XX model
Wonmin Son, Vlatko Vedral
We compare the critical behavior of the ground state and the thermal state of the XX model. We analyze the full energy spectrum and the eigenstates to reconstruct the ground state…
Classical and quantum correlations under decoherence
J. Maziero, L. C. Celeri, R. M. Serra +1
Recently some authors have pointed out that there exist nonclassical correlations which are more general, and possibly more fundamental, than entanglement. For these general quantu…
Entanglement swapping of the valence-bond solid state with local filtering operations
Heng Fan, Zi-Dan Wang, Vlatko Vedral
A basic problem of quantum communication is to generate entangled states between distant sites. Using entanglement swapping, we are able to generate an entangled state of the desir…
Entanglement in pure and thermal cluster states
Michal Hajdusek, Vlatko Vedral
We present a closest separable state to cluster states. We start by considering linear cluster chains and extend our method to cluster states that can be used as a universal resour…
Detection and engineering of spatial mode entanglement with ultra-cold bosons
J. Goold, Libby Heaney, Th. Busch +1
We outline an interferometric scheme for the detection of bi-mode and multi-mode spatial entanglement of finite-temperature,interacting Bose gases of fixed particle number. Whether…
Entanglement and nonlocality of a single relativistic particle
Jacob Dunningham, Vlatko Vedral
Recent work has argued that the concepts of entanglement and nonlocality must be taken seriously even in systems consisting of only a single particle. These treatments, however, ar…