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Related Concept Videos

Buffers02:56

Buffers

173.2K
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
173.2K
Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

2.5K
Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
2.5K
Buffer Effectiveness02:19

Buffer Effectiveness

55.5K
Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
55.5K
Calculating pH Changes in a Buffer Solution02:45

Calculating pH Changes in a Buffer Solution

58.9K
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
58.9K
Phosphate Buffer01:22

Phosphate Buffer

5.4K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
5.4K
Buffers: Overview01:30

Buffers: Overview

10.2K
Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
10.2K

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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All-optically tunable buffer for single photons.

Stéphane Clemmen, Alessandro Farsi, Sven Ramelow

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    |May 2, 2018
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    Summary
    This summary is machine-generated.

    Researchers developed a novel photon buffer for quantum communication using a quantum frequency conversion-dispersion technique. This all-fiber system provides tunable optical delays for single photons, minimizing noise and loss for enhanced quantum network performance.

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    Area of Science:

    • Quantum optics
    • Quantum communication

    Background:

    • Quantum communication systems require efficient methods for manipulating quantum information, including temporal buffering of single photons.
    • Existing methods for photon buffering often suffer from noise, loss, or limited tunability.

    Purpose of the Study:

    • To demonstrate a novel all-fiber photon buffer for quantum communication systems.
    • To achieve all-optical, continuously tunable delays for single photons with high efficiency and low noise.

    Main Methods:

    • Utilizing a quantum frequency conversion-dispersion technique based on Bragg scattering four-wave mixing.
    • Implementing an all-fiber setup to impart delays onto single photons.

    Main Results:

    • Demonstrated all-optical and continuously tunable delays for single photons.
    • Achieved tunable delays up to 23 times the photon duration.
    • Reported on/off efficiencies as high as 55% with minimal photon noise and absorption.

    Conclusions:

    • The developed photon buffer is a promising component for advancing quantum communication systems.
    • The all-fiber, tunable nature of the buffer offers significant advantages for practical quantum network implementation.