To start the key exchange, Bob sends Alice two strong laser pulses separated by a precise interval.
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It needs to be sending radio signals or laser pulses, or some other form of signal that we can detect.
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LiDAR fires thousands of laser pulses per second at the ground.
Earlier this year a team at Lund University in Sweden used a laser with pulses measured in attoseconds (billion billionths of a second) to record an electron in motion.
He used photons (in the form of carefully calibrated pulses of laser light) to probe atoms.
They used intense nanosecond pulses of laser light to turn the metal's lustrous surface a deep black.
To measure the energy in question, he used two successive pulses of laser light, each 250 attoseconds long.
Using pulses of laser light aimed through the appropriate microlenses, the researchers were able to set each of the qubits into a particular initial state a necessary precursor to any calculation.
Such snapshots, which are captured by using pulses of laser light a few femtoseconds long rather than by physically clicking a shutter, are able to catch molecules in the process of reacting together.
The technology uses a femtosecond laser, which means it pulses at speeds of one-quadrillionth of a second.
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If a rock has a coating of dust, hundreds of repeated pulses from the laser can remove those layers.
Newer developments in laser technology, such as nonablative fractional resurfacing, in which the laser divides the light up into many smaller pulses, have decreased the healing time.
The new single-laser fiber-optic speed record was set using a technique called fast Fourier transform that pulses light at an incredibly high rate with data encoded in 325 distinct colors across the spectrum.
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