Because physicists have also
created pairs of photons, particles of light, called qudits, with a D, for multiple dimensions.
On La Palma
we created a pair of photons and sent one of the photons over to Tenerife using a free space telescope link, and on Tenerife we decided a long time before the photon arrived which polarization would be measured.
This process is generally presumed to
create pairs of photons that are entangled, so that the photons» polarizations are highly correlated with one another.
Not exact matches
In an oft - repeated version
of the
photon experiment, a
pair of entangled
photons, A and B, are
created by a laser beam.
And which kind
of measurement to perform on this
photon is decided by a random - number generator at the same moment when the
photon pairs are
created at a distant location, about a mile away, which means that no signal could travel fast enough to influence this.
To start the ROT protocol, Alice
creates pairs of entangled
photons.
Kalashnikov and his team used a special crystal to
create a
pair of entangled
photons, a visible one and an infrared one (see image).
In developing the method, Kwiat and his team first passed a laser pulse through two adjacent nonlinear crystals to
create pairs of polarization - entangled
photons.
Once
created, each entangled
pair of photons is separated by passing a laser beam made up
of them through a filter made from a non-linear crystal.
Physicists know how to
create pairs of entangled
photons, sub-atomic light particles, and have observed them operating in sync between two
of the Canary Islands at a distance
of 143 kilometers.
As described in a paper posted online and submitted to Physical Review Letters (PRL), * researchers from NIST and several other institutions
created pairs of identical light particles, or
photons, and sent them to two different locations to be measured.