Level 1 — Absolute Beginner
Scientists sent special light through a long cable. The light was made of tiny pieces called photons.
The photons were 'entangled'. This means two photons stay connected, even far apart.
The cable was 62 kilometers long. It connected two places in Maryland, in the United States.
This test worked very well. It could help build a new kind of internet in the future.
- scientist
- a person who studies how things in the world work
- light
- the energy that lets us see things
- photon
- a tiny particle of light
- connect
- to join two things together
- cable
- a long wire or line used to carry signals
- far
- a long distance away
- test
- an experiment to see if something works
- future
- the time that has not happened yet
Level 2 — Elementary
Researchers from the National Institute of Standards and Technology, the University of Maryland, and the company Qunnect have successfully sent entangled photons across 62 kilometers of ordinary commercial fiber optic cable.
The cable connects NIST's campus in Gaithersburg, Maryland, to the University of Maryland's campus in College Park, running along utility poles like the fiber that already carries everyday internet traffic.
Aerial fiber like this usually causes problems for entanglement, because wind, traffic, and temperature changes shift the light inside the cable. The team solved this using special devices built by Qunnect that constantly correct for these changes.
The result was impressive: the system delivered entangled photon pairs at a rate of 1,500 per second and kept the photons entangled for more than 92 percent of a 24 hour test.
- researcher
- a person who carries out scientific study
- entangled
- linked in a special quantum way so that two particles affect each other
- commercial
- related to buying, selling, or everyday business use
- campus
- the grounds and buildings of a university or institution
- utility pole
- a tall pole that carries wires for electricity or cables
- correct
- to fix or adjust something so it works properly
- rate
- the speed at which something happens
- result
- the outcome of an experiment or action
Level 3 — Intermediate
A team from the National Institute of Standards and Technology, the University of Maryland, and the quantum networking company Qunnect has demonstrated the distribution of entangled photons over 62 kilometers of commercial aerial fiber, connecting NIST's Gaithersburg campus with the University of Maryland's College Park campus.
Unlike laboratory experiments conducted over dedicated, carefully shielded fiber, this deployment ran through the same kind of telecommunications infrastructure already strung along utility poles across American suburbs, exposing the entangled photons to wind, passing traffic, and daily temperature swings that constantly shift the light's polarization.
To counter this instability, the team integrated automated polarization compensation devices developed by Qunnect, which periodically send pulses of reference light through the fiber and measure how their polarization has been altered, then apply real time corrections to preserve the entanglement.
The approach paid off: the system sustained an entangled photon distribution rate of 1,500 pairs per second while violating the Bell inequality, the mathematical signature of genuine quantum entanglement, for more than 92 percent of a full day long test, offering strong evidence that quantum networks can be built on infrastructure that already exists rather than requiring costly new dedicated fiber.
- distribution
- the act of spreading or delivering something across a system
- deployment
- the act of putting something into use in a real setting
- infrastructure
- the basic physical systems and structures needed for a service to operate
- polarization
- the orientation of the oscillations of a light wave
- instability
- a lack of steadiness or a tendency to change unpredictably
- compensation
- an adjustment made to correct for an error or imbalance
- sustain
- to keep something going over a period of time
- signature
- a distinctive characteristic that identifies something
Level 4 — Advanced
A collaborative team from the National Institute of Standards and Technology, the University of Maryland, and the quantum networking startup Qunnect has demonstrated sustained distribution of entangled photon pairs across 62 kilometers of commercial aerial fiber, linking NIST's Gaithersburg campus to the University of Maryland's College Park campus over infrastructure indistinguishable, at least physically, from the fiber already carrying suburban internet traffic.
Where prior demonstrations of long distance entanglement have typically relied on dedicated, environmentally shielded fiber laid specifically for laboratory purposes, this deployment instead traversed cable suspended from utility poles and thus subject to the full range of ambient perturbations, wind induced vibration, passing vehicular traffic, and diurnal temperature fluctuation, all of which continuously reshape the polarization state of transmitted light and threaten to unravel fragile quantum correlations.
To counteract this instability, the researchers deployed automated polarization compensation hardware engineered by Qunnect, which interleaves reference light pulses through the fiber, measures the resulting polarization drift, and applies corrective transformations in real time, effectively stabilizing the channel against the very perturbations that have historically confined entanglement distribution to controlled laboratory environments.
The resulting system sustained an entangled photon distribution rate of 1,500 pairs per second while violating the Bell inequality, the decisive statistical benchmark distinguishing genuine quantum correlation from any classical explanation, for upward of 92 percent of a continuous 24 hour trial, a result the team frames as compelling validation that metropolitan scale quantum networks can be layered atop existing commercial telecommunications infrastructure rather than demanding the wholesale construction of purpose built quantum fiber.
- collaborative
- involving multiple people or organizations working together
- traverse
- to travel across or through something
- perturbation
- a disturbance that causes a small change to a system
- diurnal
- occurring every day; relating to daily cycles
- unravel
- to cause something to come apart or fail
- interleave
- to insert something between existing elements in a sequence
- benchmark
- a standard or reference point used for comparison
- purpose-built
- designed and constructed for a specific use
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