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We investigate in a general form entanglement of biphoton qutrits and ququarts, i.e. states formed in the processes of collinear and, correspondingly, degenerate and non-degenerate Spontaneous Paramet...
General theory of assisted entanglement distillation
General theory o assisted entanglement distillation
2010/10/21
We evaluate the one-shot entanglement of assistance for an arbitrary bipartite state. This yields another interesting result, namely a characterization of the one-shot distillable entanglement of a bi...
Low energy states dynamic of entanglement for spin systems
Low energy states dynamic of entanglement spin systems
2010/10/20
We have composed the ideas of quantum renormalization group and quantum information by
exploring the low energy states dynamic of entanglement resources of a system close to its quantum critical poin...
Quantum Entanglement Initiated Super Raman Scattering
Quantum Entanglement Initiated Super Raman Scattering
2010/10/21
It has now been possible to prepare chain of ions in an entangled state and thus question arises — how the optical properties of a chain of entangled ions differ from say a chain of independent partic...
Entanglement of light-shift compensated atomic spin waves with telecom light
Entanglement light-shift compensated atomic spin waves telecom light
2010/10/20
Entanglement of a 795 nm light polarization qubit and an atomic Rb spin wave qubit for a storage time of 0.1 s is observed by measuring the violation of Bell’s inequality (S = 2.65±0.12). Long qubit s...
Dynamical enhancement of spatial entanglement in massive particles
Dynamical enhancement spatial entanglement massive particles
2010/10/20
We discuss dynamical enhancement of entanglement in a driven Bose-Hubbard model and find
an enhancement of two orders of magnitude which is robust against fluctuations in experimental
parameters.
Insecurity of position-based quantum cryptography protocols against entanglement attacks
Insecurity position-based quantum cryptography protocols entanglement attacks
2010/10/19
Recently, position-based quantum cryptography has been claimed to be unconditionally secure.
On the contrary, here we show that the existing proposals for position-based quantum cryptography are, in ...
Evaluation of ground state entanglement in spin systems with the random phase approximation
Evaluation ground state entanglement spin systems random phase approximation
2010/10/19
We discuss a general treatment based on the mean field plus random phase approximation (RPA)
for the evaluation of subsystem entropies and negativities in ground states of spin systems. The approach ...
Qubit Entanglement Dephasing Dynamics Driven by a Bath of Spins
Qubit Entanglement Dephasing Dynamics Driven Bath of Spins
2010/10/19
We study the entanglement dynamics for a two-spin system coupled to a spin environment of
different configurations by z-x type interaction. The models considered in this paper are solved both analyti...
Entanglement entropy between two coupled Tomonaga-Luttinger liquids
Entanglement entropy coupled Tomonaga-Luttinger liquids
2010/10/27
We consider a system of two coupled Tomonaga-Luttinger liquids (TLL) on parallel chains and
study the R´enyi entanglement entropy Sn between the two chains. The limit n ! 1 corresponds
to the ...
Optimal Entanglement Transformations Among N-qubit W-Class States
Optimal Entanglement Transformations N-qubit W-Class States
2010/10/19
We investigate the physically allowed probabilities for transforming one N-partite W-class state to another by means of local operations assisted with classical communication (LOCC). Recently,Kintas a...
Suppressing decoherence and improving entanglement by quantum-jump-based feedback control in two-level systems
Suppressing decoherence improving entanglement by quantum-jump-based feedback two-level systems
2010/10/19
We study the quantum-jump-based feedback control on the entanglement shared between two
qubits with one of them subject to decoherence, while the other qubit is under the control. This situation is v...
Entanglement dynamics via coherent-state propagators
Entanglement dynamics coherent-state propagators
2010/10/19
The dynamical generation of entanglement in closed bipartite systems is investigated in the semi-classical regime. We consider a model of two particles, initially prepared in a product of coherent sta...
Entanglement spectrum of random-singlet quantum critical points
Entanglement spectrum random-singlet quantum critical points
2010/10/22
The entanglement spectrum, i.e., the full distribution of Schmidt eigenvalues of the reduced
density matrix, contains more information than the conventional entanglement entropy and has been studied ...
Entanglement can increase asymptotic rates of zero-error classical communication over classical channels
Entanglement asymptotic rates zero-error classical communication classical channels
2010/10/18
It is known that the number of di erent classical messages which can be communicated
with a single use of a classical channel with zero probability of decoding error can sometimes
be increased by us...