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Is the notion of a quantum computer (QC) resilient to thermal noise unphysical? We address this question from a constructive perspective and show that local quantum Hamiltonian models provide self-correcting QCs. To this end, we first give a sufficient condition on the connectedness of excitations for a stabilizer code model to be a self-correcting quantum… (More)

Tobias Graß,1 Christine Muschik,1,2,3 Alessio Celi,1 Ravindra W. Chhajlany,1,4 and Maciej Lewenstein1,5 1ICFO-Institut de Ciències Fotòniques, Av. Carl Friedrich Gauss 3, 08860 Barcelona, Spain 2Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria 3Institute for Theoretical Physics, University… (More)

- Antoni Wójcik, Andrzej Grudka, Ravindra W. Chhajlany
- Quantum Information Processing
- 2003

Maximally entangled states of two qubits—the so called Bell states form a basic element of many quantum information protocols—e.g. quantum teleportation and quantum dense coding to mention only the most popular. Recently some protocols have been generalized to make use of ddimensional quantum systems—qudits instead of qubits.. In this context attention was… (More)

- Lukasz Czekaj, Jarek K. Korbicz, Ravindra W. Chhajlany, Pawel Horodecki
- Quantum Cryptography and Computing
- 2010

- Timothy A Miller, Ravindra W Chhajlany, +6 authors Simon Wall
- Nature communications
- 2015

In-plane anisotropic ground states are ubiquitous in correlated solids such as pnictides, cuprates and manganites. They can arise from doping Mott insulators and compete with phases such as superconductivity; however, their origins are debated. Strong coupling between lattice, charge, orbital and spin degrees of freedom results in simultaneous ordering of… (More)

- Przemysław R Grzybowski, Łukasz Czekaj, Mariusz Nogala, Adam Ścibior, Ravindra W Chhajlany
- Physical review. E
- 2016

Models of noninteracting fermions coupled to auxiliary classical fields are relevant to the understanding of a wide variety of problems in many-body physics, e.g., the description of manganites, diluted magnetic semiconductors, or strongly interacting electrons on lattices. We present a flat-histogram Monte Carlo algorithm that simulates a statistical… (More)

Cold atoms in an optical lattice with brick-wall geometry have been used to mimic graphene, a two-dimensional material with characteristic Dirac excitations. Here we propose to bring such artificial graphene into the proximity of a second atomic layer with a square lattice geometry. For non-interacting fermions, we find that such bilayer system undergoes a… (More)

- Ravindra Chhajlany, Ryszard Parzyński, Antoni Wójcik, przestrzeniach Hilberta
- 2003

It is a pleasure to thank both Dr hab. A. Wójcik and Dr A. Grudka with whom the work " Generation of inequivalent generalized Bell bases " was written. I wholeheartedly thank everybody who has supported and helped me throughout the entire period of my studies. Finally, I would like to thank Mummy and Ania for reading the manuscript and also for their… (More)

The oracle model of computation is believed to allow a rigorous proof of quantum over classical computational superiority. Since quantum and classical oracles are essentially different, a correspondence principle is commonly implicitly used as a platform for comparison of oracle complexity. Here, we question the grounds on which this correspondence is… (More)

- Jun Jing, Ravindra W. Chhajlany, Lian-Ao Wu
- Scientific reports
- 2017

We prove a general theorem that the action of arbitrary classical noise or random unitary channels can not increase the maximum population of any eigenstate of an open quantum system, assuming initial system-environment factorization. Such factorization is the conventional starting point for descriptions of open system dynamics. In particular, our theorem… (More)