342 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
On R\'{e}nyi Differential Privacy in Statistics-Based Synthetic Data Generation
Privacy protection with synthetic data generation often uses differentially
private statistics and model parameters to quantitatively express theoretical
security. However, these methods do not take into account privacy protection
due to the randomness of data generation. In this paper, we theoretically
evaluate R\'{e}nyi differential privacy of the randomness in data generation of
a synthetic data generation method that uses the mean vector and the covariance
matrix of an original dataset. Specifically, for a fixed , we show
the condition of such that the synthetic data generation
satisfies -R\'{e}nyi differential privacy under a
bounded neighboring condition and an unbounded neighboring condition,
respectively. In particular, under the unbounded condition, when the size of
the original dataset and synthetic datase is 10 million, the mechanism
satisfies -R\'{e}nyi differential privacy. We also show that when
we translate it into the traditional -differential
privacy, the mechanism satisfies -differential privacy.Comment: 18 pages, 3 figure
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