Talk:Superdense coding: Difference between revisions

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{{WikiProject Computer sciencebanner shell|class=C |importance=high}}

{{WikiProject Computer science |importance=high}}

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==Untitled==

"Quantum dense coding" and "Superdense coding" mean the same thing. The two articles should be merged asa proposed. [[User:Cryptonaut|Cryptonaut]] 02:36, 25 April 2006 (UTC)

:I agree, merge 'em. —[[User:Keenan Pepper|Keenan Pepper]] 02:45, 25 April 2006 (UTC)

==Wiki Education Foundation-supported course assignment==

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== Correction for diagram. ==

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:The current version of the diagram is correct. --[[User:RobinK|Robin]] ([[User talk:RobinK|talk]]) 23:26, 16 June 2018 (UTC)

Bob does indeed need to apply a SWAP operation as his final step. In other words, [SWAP * kron(H,I) * CNOT] * [Alice's transformation] * [1;0;0;0] is the full process from the creation of two qubits to the final measurement, where the first term is Bob's decoding operation and the other two terms form one of the four Bell states. Note, however, that the computation of Bell state B11 in the "Encoding" section is also wrong: it appears someone mixed up the |01> and |10> states. [[Special:Contributions/218.252.52.182|218.252.52.182]] ([[User talk:218.252.52.182|talk]]) 21:19, 14 January 2020 (UTC)

== "Why" ==

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Could there perhaps be some explanation of the overview statement "Alice must tell Bob which gate to apply after he receives the entangled qubit in order to obtain the correct classical bits." It does not seem to be explained anywhere. <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/118.209.183.247|118.209.183.247]] ([[User talk:118.209.183.247#top|talk]]) 14:36, 10 January 2019 (UTC)</small> <!--Autosigned by SineBot--> now signed by [[Special:Contributions/118.209.183.247|118.209.183.247]] ([[User talk:118.209.183.247|talk]]) 10:29, 12 January 2019 (UTC)johnjPerth

== Deceptive video? ==

The video "Video superdense coding.ogg" seems to be selling an idea that isn't true. In the video A is connected to B via a single wavy line. This is contrary to the protocol which requires two qubits. The article even says "Without access to Bob's qubit, Eve is unable to get any information from Alice's qubit." The description in the External link "Superdense coding: how to send two bits using one qubit on YouTube by Michael Nielsen" is not as pretty, but much more accurate. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 16:55, 22 February 2025 (UTC)