Related Experiment Video
Updated: May 4, 2026
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 12, 2013
13.1K
Experimental entanglement distillation and 'hidden' non-locality.
P G Kwiat1, S Barraza-Lopez, A Stefanov
1Physics Division, Los Alamos National Laboratory, New Mexico 87545, USA. Kwiat@uiuc.edu
Nature
|March 10, 2001
Summary
Researchers distilled maximally entangled quantum states from imperfect, non-maximally entangled inputs. This process enhances quantum information applications by improving state purity and entanglement, revealing hidden non-locality.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Foundations
Background:
- Entangled quantum states are crucial for quantum information processing tasks like teleportation, computation, and cryptography.
- Practical quantum states are often degraded by dissipation and decoherence, resulting in non-maximal entanglement or mixed states.
Purpose of the Study:
- To experimentally demonstrate the distillation of maximally entangled quantum states from non-maximally entangled and mixed initial states.
- To improve the quality of entangled states for enhanced performance in quantum information applications.
Main Methods:
- Utilized partial polarizers to filter and enhance the entanglement of pure, polarization-entangled photon pairs.
- Applied filtering techniques to partially mixed entangled states to distill higher-quality states.
Main Results:
- Successfully distilled maximally entangled states from non-maximally entangled inputs through a filtering process.
- Demonstrated that the distilled states exhibit non-local correlations, violating a form of Bell's inequality, which was not present in the initial states.
Conclusions:
- Experimental distillation can recover high-quality entangled states from degraded initial conditions.
- The demonstrated method effectively enhances entanglement and reveals 'hidden' non-locality in quantum states, crucial for advancing quantum technologies.
Related Concept Videos
02:39Entropy
26.1K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
26.1K
01:01Distillation: Vapor–Liquid Equilibria
4.1K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
4.1K
01:27Inductive Effects on Chemical Shift: Overview
2.3K
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
2.3K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.3K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.3K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
01:20Entropy and the Second Law of Thermodynamics
3.3K
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...
3.3K