419 citations
- Massachusetts Institute of TechnologyUS181 papers
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21 papers · 1 filter
Symmetry-assisted adversaries for quantum state generation
Andris Ambainis, Loïck Magnin, Martin Roetteler +1
We introduce a new quantum adversary method to prove lower bounds on the query complexity of the quantum state generation problem. This problem encompasses both, the computation of…
Quantum property testing for bounded-degree graphs
Andris Ambainis, Andrew M. Childs, Yi-Kai Liu
We study quantum algorithms for testing bipartiteness and expansion of bounded-degree graphs. We give quantum algorithms that solve these problems in time O(N^(1/3)), beating the O…
Quantum computation with devices whose contents are never read
Abuzer Yakaryilmaz, Rusins Freivalds, A. C. Cem Say +1
In classical computation, a "write-only memory" (WOM) is little more than an oxymoron, and the addition of WOM to a (deterministic or probabilistic) classical computer brings no ad…
Cascade coherence transfer and magneto-optical resonances at 455 nm excitation of Cesium
Marcis Auzinsh, Ruvin Ferber, Florian Gahbauer +3
We present and experimental and theoretical study of nonlinear magneto-optical resonances observed in the fluorescence to the ground state from the 7P_{3/2} state of cesium, which…
Generation of energy selective excitations in quantum Hall edge states
C. Leicht, P. Mirovsky, B. Kaestner +7
We operate an on-demand source of single electrons in high perpendicular magnetic fields up to 30T, corresponding to a filling factor below 1/3. The device extracts and emits singl…
Energy oscillations and a possible route to chaos in a modified Riga dynamo
Frank Stefani, Agris Gailitis, Gunter Gerbeth
Starting from the present version of the Riga dynamo experiment with its rotating magnetic eigenfield dominated by a single frequency we ask for those modifications of this set-up…