Spin qubits in double quantum dots: Entanglement versus the Kondo effect

@article{Ramak2006SpinQI,
  title={Spin qubits in double quantum dots: Entanglement versus the Kondo effect},
  author={Anton Ram{\vs}ak and Jernej Mravlje and Rok Žitko and Janez Bonca},
  journal={Physical Review B},
  year={2006},
  volume={74},
  pages={241305}
}
We investigate the competition between pair entanglement of two spin qubits in double quantum dots attached to leads with various topologies and the separate entanglement of each spin with nearby electrodes. Universal behavior of entanglement is demonstrated in dependence on the mutual interactions between the spin qubits, the coupling to their environment, temperature, and magnetic field. As a consequence of quantum phase transition an abrupt switch between fully entangled and unentangled… Expand

Figures from this paper

Entanglement switching via the Kondo effect in triple quantum dots
We consider a triple quantum dot system in a triangular geometry with one of the dots connected to metallic leads. Using Wilson’s numerical renormalization group method, we investigate quantumExpand
Entanglement and the Kondo effect in serially coupled double quantum dots
Abstract.We investigate entanglement between electrons in serially coupled double quantum dots attached to noninteracting leads. In addition to local repulsion we consider the influence of capacitiveExpand
Quantum entanglement of space domains occupied by interacting electrons
Spin-entanglement of two electrons occupying two spatial regions -- domains -- is expressed in a compact form in terms of spin-spin correlation functions. The power of the formalism is demonstratedExpand
Inducing spin correlations and entanglement in a double quantum dot through nonequilibrium transport.
For a double quantum dot system in a parallel geometry, we demonstrate that by combining the effects of a flux and driving an electrical current through the structure, the spin correlations betweenExpand
Diatomic molecule as a quantum entanglement switch
Abstract We investigate a pair entanglement of electrons in diatomic molecule, modeled as a correlated double quantum dot attached to the leads. The low-temperature properties are derived from theExpand
Dynamics of electron entanglement in semiconductor nanostructures
Quantum entanglement, the most remarkable feature of quantum physics, is recognized as a resource for quantum information processing. The quest for quantum-computing devices has also produced greatExpand
Quantum entanglement of parallel-coupled double quantum dots: A theoretical study using the hierarchical equations of motion approach†
Quantum dots comprise a type of quantum impurity system. The entanglement and coherence of quantum states are significantly influenced by the strong electron-electron interactions among impuritiesExpand
Spin-spin correlations of entangled qubit pairs in the Bohm interpretation of quantum mechanics
A general entangled qubit pair is analyzed in the de Broglie?Bohm formalism corresponding to two spin-1/2 quantum rotors. Several spin?spin correlators of Bohm?s hidden variables are analyzedExpand
Voltage-controllable multifunctional spin polarizer based on side-coupled quantum dots
Abstract Quantum dot system is considered as the prime candidate for nanospintronics devices, within which to generate spins one by one is the long term goal for quantum information and quantumExpand
Crossover between two different Kondo couplings in side-coupled double quantum dots
We study the Kondo effect in side-coupled double quantum dots with particular focus on the crossover between two distinct singlet ground states, using the numerical renormalization group. TheExpand
...
1
2
3
...

References

SHOWING 1-10 OF 30 REFERENCES
Quantum Computation and Quantum Information
Preface Acknowledgement Nomenclature and notation Part I. Fundamental Concepts: 1. Introduction and overview 2. Introduction to quantum mechanics 3. Introduction to computer science Part II. QuantumExpand
“A and B”:
Direct fabrication of large micropatterned single crystals. p1205 21 Feb 2003. (news): Academy plucks best biophysicists from a sea of mediocrity. p994 14 Feb 2003.
Eur
  • Phys. J. B52, 291 (2006); S. Oh and J. Kim, Phys. Rev. B73, 052407
  • 2006
Phys
  • Rev. B 73, 035332
  • 2006
Phys
  • Rev. A 73, 012109
  • 2006
Phys
  • Rev. B 73, 241305(R)
  • 2006
Phys
  • Rev. A 74, 010304(R)
  • 2006
A
  • Yac oby, M. D. Lukin, C. M. Marcus, M. P. Hanson, and A. C. Gossard, Science309, 2180
  • 2005
Phys
  • Rev. B 71, 075305
  • 2005
Science 309
  • 268
  • 2005
...
1
2
3
...