# Analysis and minimization of bending losses in discrete quantum networks

@article{Nikolopoulos2012AnalysisAM, title={Analysis and minimization of bending losses in discrete quantum networks}, author={Georgios M. Nikolopoulos and Anton{\'i}n Hoskovec and Igor Jex}, journal={Physical Review A}, year={2012}, volume={85} }

We study theoretically the transfer of quantum information along bends in two-dimensional discrete lattices. Our analysis shows that the fidelity of the transfer decreases considerably, as a result of interactions in the neighbourhood of the bend. It is also demonstrated that such losses can be controlled efficiently by the inclusion of a defect. The present results are of relevance to various physical implementations of quantum networks, where geometric imperfections with finite spatial extent…

## 11 Citations

### Decoupling bent quantum networks

- Computer Science2014 International Symposium on Information Theory and its Applications
- 2014

The analytically found correction procedure is tested using numerical simulations on a number of realistic cases and confirms that the occurring errors can be efficiently compensated for a wide range of system parameters.

### State Transfer Hamiltonians in Photonic Lattices

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Faithful communication is a necessary precondition for large scale all-optical networking and quantum information processing. Related theoretical investigations in different areas of physics have led…

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This work presents selective dynamical decoupling schemes which are capable of stabilizing imperfect quantum state transfer protocols on the model of a bent linear qubit chain and demonstrates their efficiency in numerical simulations.

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- Physics
- 2015

The ability to navigate light signals in two-dimensional networks of waveguide arrays is a prerequisite for the development of all-optical integrated circuits for information processing and…

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- 2012

This work presents the first experimental realization of a finite discrete lattices channel with judiciously engineered couplings in the framework of femtosecond-laser-written waveguide arrays.

### Advanced dynamical decoupling strategies for simulating Hamiltonian interactions

- Physics
- 2016

In the field of quantum information, a major challenge is to protect and shield quantum systems from environmental influences, which cause dissipation and decoherence. One approach to address this…

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Certain nonuniformly coupled spin chains can exhibit perfect transfer of quantum states from end to end. Motivated by recent experimental implementations in evanescently coupled waveguide arrays, we…

### Spin chain systems for quantum computing and quantum information applications

- Computer Science
- 2018

Spin chains are presented as reliable devices for quantum communication with high transfer fidelities, entanglement generation and distribution over distant parties and protected storage of quantum information.

### Czech Technical University in Prague Faculty of Nuclear Sciences and Physical Engineering DOCTORAL THESIS State Transfer in Imperfect Networks Prague 2020

- Physics, Computer Science
- 2020

This work explores the adverse effects of several perturbations of the ideal models inspired by the physical character of these systems, and proposes Dynamical Decoupling, a quantum error correction method, restricted to using single-particle operations only.

### Automatic spin-chain learning to explore the quantum speed limit

- Computer SciencePhysical Review A
- 2018

This work considers a specific task from quantum physics, i.e. quantum state transfer in a one-dimensional spin chain, and converts the state transfer process into a Markov decision process that can be understood by the machine.

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