Source of Single Photon State
Single photons are routinely generated using single emitters (atoms, Nitrogen-vacancy center, Quantum dot ). However, these sources are not always very efficient (low probability of actually getting a single photon on demand) and often complex and unsuitable out of a laboratory environment. Other sources are commonly used that overcome these issues at the expense of an nondeterministic behavior. Heralded single photon sources are probabilistic two-photon sources from whom the pair is split and the detection of one photon heralds the presence of the remaining one. These sources usually rely on the optical nonlinearity of some materials like periodically poled Lithium niobate (Spontaneous parametric down-conversion), or silicon (spontaneous Four-wave mixing) for example.
Read more about this topic: Fock State
Famous quotes containing the words source of, source, single and/or state:
“Anti-Semitism is a horrible disease from which nobody is immune, and it has a kind of evil fascination that makes an enlightened person draw near the source of infection, supposedly in a scientific spirit, but really to sniff the vapors and dally with the possibility.”
—Mary McCarthy (1912–1989)
“The family: I believe more unhappiness comes from this source than from any other—I mean the attempt to prolong family connection unduly, and to make people hang together artificially who would never naturally do so.”
—Samuel Butler (1835–1902)
“Not a single man on earth knows from his own experience the how and where of his birth, only from tradition, which is often very uncertain.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“He is a poor man and has got behind-hand and when that’s the case, there is no staying in the settlements; for those varmints, the sheriffs and constables, are worse than the Indians, because you can kill Indians and you dare not kill the sheriffs.”
—For the State of West Virginia, U.S. public relief program (1935-1943)