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Evidence for quantum annealing with more than one hundred qubits
Quantum annealing is expected to solve certain optimization problems more efficiently, but there are still open questions regarding the functioning of devices such as D-Wave One. A numerical and…
Defining and detecting quantum speedup
Here, it is shown how to define and measure quantum speedup and how to avoid pitfalls that might mask or fake such a speedup, and the subtle nature of the quantum speed up question is illustrated.
Probing for quantum speedup in spin-glass problems with planted solutions
The availability of quantum annealing devices with hundreds of qubits has made the experimental demonstration of a quantum speedup for optimization problems a coveted, albeit elusive goal. Going…
Optimised simulated annealing for Ising spin glasses
Comment on: "Classical signature of quantum annealing"
In a recent preprint (arXiv:1305.4904) entitled "Classical signature of quantum annealing" Smolin and Smith point out that a bimodal distribution presented in (arXiv:1304.4595) for the success…
Quantum versus classical annealing of Ising spin glasses
The question of when quantum speedup may be expected is revisited and it is shown that the results depend on how the problem is described and how the optimization routine is implemented, which implies that care must be taken when using QMC simulations to assess the potential for quantum speed up.
Reexamining classical and quantum models for the D-Wave One processor
We revisit the evidence for quantum annealing in the D-Wave One device (DW1) based on the study of random Ising instances. Using the probability distributions of finding the ground states of such…
Correlation and dimensional effects of trions in carbon nanotubes
We study the binding energies of singlet trions, i.e. charged excitons, in carbon nanotubes. The problem is modeled, through the effective-mass model, as a three-particle complex on the surface of a…
Biexciton binding energy in fractional dimensional semiconductors
Stability of singlet and triplet trions in carbon nanotubes