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  2. Smart doorbell - Wikipedia

    en.wikipedia.org/wiki/Smart_doorbell

    A smart doorbell is an internet-connected doorbell that notifies the home owner on his or her device (smartphone or any other gadget) when a visitor arrives at the door. It activates when the visitor presses the button of the doorbell, or alternatively, when the doorbell senses a visitor with its built-in motion sensors. The smart doorbell lets ...

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  4. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

  5. Fish doorbell - Wikipedia

    en.wikipedia.org/wiki/Fish_doorbell

    A fish doorbell (Dutch: visdeurbel) is a system that allows fish to pass through a closed sluice gate through crowdsourced input when fish are present. The Utrecht Visdeurbel uses a livestreamed underwater camera that allows users to press a doorbell button to notify the lock operator that there are fish swimming in the gracht, and that the lock should be opened. [1]

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  7. Quantum gate teleportation - Wikipedia

    en.wikipedia.org/wiki/Quantum_gate_teleportation

    Applying a CNOT gate by using gate teleportation. Uses Bell basis measurement (decomposed here into a CNOT, an H, and two measurements), Bell basis initialization (decomposed here into two resets, an H, and a CNOT), and classical feedback in the form of Pauli operations controlled by the measurement results.

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