Related Experiment Video
Updated: Jul 24, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.0K
Redundancy and Synergy of an Entangling Cloner in Continuous-Variable Quantum Communication.
1Department of Optics, Palacky University, 17. Listopadu 12, 77900 Olomouc, Czech Republic.
Entropy (Basel, Switzerland)
|July 8, 2023
Summary
Minimizing information leakage in quantum channels is crucial. This study shows that for individual attacks, using signal states with variance equivalent to vacuum fluctuations prevents optimal eavesdropping by entangling cloners.
Area of Science:
- Quantum Information Science
- Quantum Communication Security
Background:
- Minimizing information leakage is essential for secure quantum communication.
- Collective attacks on quantum channels are well-understood regarding minimum leakage regimes.
- Individual attacks present a different challenge for information leakage minimization.
Purpose of the Study:
- To derive the minimum information leakage condition for individual attacks on quantum channels.
- To analyze the properties of mutual information in and out of the minimum leakage regime.
- To evaluate the effectiveness of entangling cloner attacks under different signal variances.
Main Methods:
- Analytical derivation of minimum leakage conditions for individual attacks.
- Study of mutual information quantities using modulated signal states.
- Analysis of joint and independent measurements on two-mode entangling cloners.
- Investigation of statistical effects (redundancy, synergy) with varying signal variances.
Main Results:
- The minimum information leakage condition for individual attacks is the same as for collective attacks (shot-noise variance).
- In the minimum leakage regime, joint measurements on an entangling cloner are no more effective than independent measurements.
- Non-trivial statistical effects, redundancy or synergy, are observed between cloner modes when deviating from the minimum leakage regime.
- The entangling cloner attack is suboptimal for sub-shot-noise modulated signals.
Conclusions:
- The derived condition for minimum information leakage holds for both collective and individual attacks.
- Entangling cloner attacks are not universally optimal for individual eavesdropping in noisy Gaussian channels.
- Understanding noise characteristics after cloner interaction provides an advantage for secure communication schemes.
Related Concept Videos
00:59Propagation of Uncertainty from Random Error
732
An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
732
01:10Entropy Change in Reversible Processes
2.6K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.6K
01:10Propagation of Uncertainty from Systematic Error
557
The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
557
02:53Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K
01:20Entropy and the Second Law of Thermodynamics
2.9K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
The relation between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
2.9K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.2K