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So, depending on the message she would like to send, Alice performs one of the four local operations given above and sends her qubit to Bob. By performing a projective measurement in the Bell basis on the two particle system, Bob decodes the desired message.
Notice that if some mischievous person, Carol, intercepts Alice's qubit en route to Bob, all that is obtained by Carol is part of an entangled state. No useful information whatsoever is gained by Carol, unless she can interact with Bob's qubit.
==References==
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