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# Questions tagged [superdense-coding]

Superdense coding is quantum communication protocol that transmits 2 classical bits of information by sending 1 qubit, provided sender and receiver pre-shared entangled pair of qubits.

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### Super-dense coding by adding quantum correlations between classical bits

Consider the following non-local game between Alice, Bob (who are spatially separated but share a maximally entangled state) and a referee: Referee samples two question bits "$x,y$" and ...
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### Use of maps in quantum coding schemes

Suppose we construct a quantum coding scheme in which Alice and Bob agree on a number of things in advance, including, say, a bijection $\gamma$ between two sets of vectors (which live in different ...
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### Why a basis in super dense quantum coding?

In the classical super dense quantum coding scheme of Bennet and Wiesner (1992), the authors start from an element in the Bell base (which consists of $4 = 2^2 = 2 \times 2$ states, in dimension $4$), ...
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### $2$ ebits $+$ $1$ bit $= 2$ bits?

The Set-Up Let's say Alice and Bob share $k$ ebits, i.e., they have one-qubit each of each of the $k$ Bell states $\frac{\vert 00\rangle+\vert 11\rangle}{\sqrt{2}}$. Now, Alice wants to send $2n$ bits ...
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### What is meant by "double speed" in dense coding protocol?

As mentioned in this article, "This (densecoding) lets you transmit at double speed until the pre-delivered qubits run out." What is meant by double speed here?
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### How do you transmit a single qubit of an entangled qubit over?

When we talk about superdense coding, we say that Alice and Bob share an entangled qubit and then after this, Alice transmits her qubit over to Bob after performing the necessary manipulation. What ...
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### Does sending a qubit using a quantum network through some conventional physical medium mean it is not with sender anymore after sending?

I was reading the wiki page on superdense coding algorithm. I am not quite sure what happens in this algorithm. When the photon which is part of entangled pair is being sent to Bob from Alice's side, ...
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### Does 1 qubit correspond to 2 bits?

In a lot of presentation I always see people say that $n$ qbit are approximately $2^n$ classical bit. Those talks where oriented for a broad audience, so they left out a lot of things. Deep down I ...
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### Significance of sharing an entangled state in Superdense Coding

The superdense coding protocol requires that A and B share an entangled state. Why is that? That is, why does the shared state have to be entangled? Does the protocol (implicitly) use the fact that ...
1 vote
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### Gate definitions for quantum random access codes

I would like to know how the gates are defined in quantum random access codes? Consider the $2 \to 1$ code described in Lemma 3.1 of this paper. The section defines the encoding and decoding circuits. ...
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### Question about the practical use of super dense coding in information transmission [duplicate]

Question about the practical use of super dense coding in information transmission: We know that by using super dense coding it is possible to transmit 2n classical bits transmitting n qubits, ...
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### What does it look like to split an EPR pair?

I am reading Quantum Computation and Quantum Information by Michael A. Nielsen & Isaac L. Chuang, and I am confused about a concept presented in Section 1.3.7: Quantum Teleportation. The book ...
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### What is the implementation of the state in superdense coding?

What is the implementation of quantum superdense coding protocol if the sender and receiver share the entangled state $\frac{1}{\sqrt{2}} (\left| 01 \right> - \left| 10\right>)$?
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### Superdense coding circuit returns wrong result

I'm new to quantum computing, but everything I've read about superdense coding claims that, in the circuit below, Bob should receive a $[01\rangle$ from Alice. Unfortunately, that's not what I get ...
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### What is the practical interest of superdense coding?

When you enter the field of quantum communications, you run at some point into the concept of superdense coding. Basically it is a way to encode classical bits on the qubits of a quantum channel, ...
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### Can superdense coding be made more efficient?

Superdense encoding allows us to transmit the information of two classical bits using a single qubit with a pre-shared Bell state qubit pair. We can duplicate the construct to transmit $2n$ classical ...
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### Eavesdropping in superdense coding: why can't the third party infer anything about the message?

There's an exercise in Nielsen & Chuang asking us to show that if some third party intercepts Alice's qubit she's sending to Bob while attempting to transmit (2 bits of) classical information, ...
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### If Alice and Bob share a Bell state, can Alice send her individual qubit to a third party?

Suppose Alice wants to send Bob information. Each of them has been sent each of the qubits of the Bell state in advance. Suppose Alice has the first qubit and Bob has the second. \$|\Phi^+\rangle = \...
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### In what ways can qubits be used for applications that do not require entanglement?

Many good questions on this site have explored how entanglement lies at the boundary between the quantum world and the classical. For example in computational speedups, or teleportation or superdense ...
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### Superdense coding projects

I have recently been studying quantum computing specially the cryptographic aspects of it. The books I followed is Nielsen and Chuang, and a book named Quantum Computing Explained by David McMohan. ...
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### Are superdense coding and teleportation just a prototype or the 'only' type?

I am interested to know if models in quantum mechanics and techniques like superdense coding teleportation are just single cases where they were found to work. Or rather just a prototype of many other ...
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### How we can describe entanglement from measurement and resource perspectives?

When we read books on quantum computing and information theory, specifically in entanglement we find some distinguishability between those who focus on entanglement as a resource or use it as an ...
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### Controlling high-dimensional Hilbert spaces with a single qubit

In superdense coding, you can use one qubit to control the Hilbert space of two qubits and steer it into 4 mutually orthogonal states, so that measurement of both qubits together will not have a ...
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### Why is super-dense coding called the inverse of quantum teleportation?

I am new to quantum computation and I recently came across the statement that super-dense coding can be called the inverse of quantum teleportation
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### What is the applicability of quantum network coding?

As the title suggests, I want to know what the applicability of quantum network coding is, besides the EPR pair construction between distant pairs of 'Users-Targets'. Can quantum network coding be ...
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