282 research outputs found
Linear optical quantum computation with frequency-comb qubits and passive devices
We propose a linear optical quantum computation scheme using time-frequency
degree of freedom. In this scheme, a qubit is encoded in single-photon
frequency combs, and manipulation of the qubits is performed using
time-resolving detectors, beam splitters, and optical interleavers. This scheme
does not require active devices such as high-speed switches and electro-optic
modulators and is robust against temporal and spectral errors, which are mainly
caused by the detectors' finite resolution. We show that current technologies
almost meet the requirements for fault-tolerant quantum computation.Comment: 6+3 pages, 3 figure
3D-XY critical fluctuations of the thermal expansivity in detwinned YBa2Cu3O7-d single crystals near optimal doping
The strong coupling of superconductivity to the orthorhombic distortion in
YBa2Cu3O7-d makes possible an analysis of the superconducting fluctuations
without the necessity of subtracting any background. The present
high-resolution capacitance dilatometry data unambiguously demonstrate the
existence of critical, instead of Gaussian, fluctuations over a wide
temperature region (+/- 10 K) around Tc. The values of the amplitude ratio
A+/A-=0.9-1.1 and the leading scaling exponent |alpha|<0.018, determined via a
least-squares fit of the data, are consistent with the 3D-XY universality
class. Small deviations from pure 3D-XY behavior are discussed.Comment: 11 pages including three figure
Electrochemical Glycosylation as an Enabling Tool for the Stereoselective Synthesis of Cyclic Oligosaccharides
Electrochemical glycosylation of a linear oligosaccharide with a protecting-group-free primary hydroxyl group afforded cyclic oligo-saccharides, up to hexasaccharides, in high yields. Precursors of the cyclic oligosaccharides were prepared by automated electro-chemical assembly-a method for the automated electrochemical solution-phase synthesis of oligosaccharides. We demonstrated that electrochemical glycosylation is useful not only for intermolecular glycosylation but also for intramolecular glycosylation to synthesize cyclic oligosaccharides
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