Related Experiment Video
Updated: Mar 18, 2026
12:19
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
8.9K
A photon-photon quantum gate based on a single atom in an optical resonator
Nature
|July 8, 2016
Summary
Researchers developed a deterministic photon-photon quantum gate using a single atom in an optical resonator. This breakthrough enables controlled interactions between photons, crucial for quantum information processing and scalable quantum computing.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Atomic Physics
Background:
- Photons are ideal for information transmission but do not interact, hindering quantum information processing.
- Deterministic photon-photon gates are essential for quantum computing but require strong optical nonlinearities not found in existing materials.
Purpose of the Study:
- To realize a deterministic photon-photon quantum gate using the Duan-Kimble protocol.
- To demonstrate a controlled phase flip (π phase shift) between photons.
Main Methods:
- Utilized strong light-matter coupling via a single atom in a high-finesse optical resonator.
- Implemented the Duan-Kimble protocol for photon-photon interaction.
Main Results:
- Achieved an average gate fidelity of (76.2 ± 3.6)%.
- Demonstrated conditional polarization flipping and entanglement generation between independent photons.
- Successfully created a universal controlled phase flip (π phase shift) photon-photon quantum gate.
Conclusions:
- The developed photon-photon quantum gate is a universal quantum logic element.
- This deterministic approach advances optical quantum information processing.
- Enables new applications in long-distance quantum communication and scalable quantum computing.
Related Concept Videos
02:45The Quantum-Mechanical Model of an Atom
61.2K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
61.2K
02:32The de Broglie Wavelength
34.3K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
34.3K
02:18The Bohr Model
82.6K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
82.6K