Alice can do it, Bob can do it, or an unrelated third party can do it. There's a lot of flexibility in who actually makes the Bell pair. That is to say, two qubits are placed into a superposition where either both are false or both are true, and then Alice and Bob each take one of those qubits. The sequence of events, from left to right, is as follows.įirst, ahead of time, Alice and Bob each get half of a Bell pair. Alice roughly corresponds to the top of the diagram, and Bob to the bottom. Imagine that Alice is the one who wants to send information, and Bob is the one who will receive it. Here is a quantum circuit diagram showing what happens, which I will explain below: The actual protocol is not too complicated, although understanding why it works can be. The ability to do a few quantum operations to qubits.A quantum communication channel to transmit qubits.
In order to do superdense coding you need three things:
CIRCUIT CODER DOUBLE SERIES
In case you don't want to watch this video explaining superdense coding (I'd recommend the whole series it's part of), I will explain it here. Which is what I mean when I say superdense coding lets you store bandwidth. Thought of another way, superdense coding turns previously entangled qubits into a fuel you can store and then later consume to double your bandwidth. Superdense coding encodes two classical bits into a single transmitted qubit, by taking advantage of a previously shared qubit. A good example of this is superdense coding. One of the things I have a hard time intuiting, in quantum computing, is the interplay between classical bits and quantum bits.
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