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How does superdense coding work?
Superdense coding is a procedure that allows someone to send two classical bits to another party using just a single qubit of communication. The teleportation protocol can be thought of as a flipped version of the superdense coding protocol, in the sense that Alice and Bob merely “swap their equipment.”
How many qubits are involved in superdense coding protocol?
We show that with the fourpartite quantum channel used to teleport an arbitrary two qubit state, we can construct a superdense coding protocol where it is possible to transmit 4 bits of classical information sending only 2 qubits.
What is the role of the third person Charlie in the first step of quantum teleportation and superdense coding?
To do this, an entangled state (e.g. a Bell state) is prepared using a Bell circuit or gate by Charlie, a third person. Her entangled qubit is then sent to Bob who, after applying the appropriate quantum gate and making a measurement, can retrieve the classical two-bit message.
Who is the third party in superdense coding?
The process starts with a third party, who we’ll call Charlie. Two qubits are prepared by Charlie in an entangled state. He initially starts the 2 qubits in the basis state |0⟩ | 0 ⟩. He applies Hadamard gate ( H H) to the first qubit to create superposition.
How are two qubits prepared in superdense coding?
Two qubits are prepared by Charlie in an entangled state. He initially starts the 2 qubits in the basis state |0⟩ | 0 ⟩. He applies Hadamard gate ( H H) to the first qubit to create superposition. He then applies CNOT gate ( CX C X) using the first qubit as a control and the second as the target.
How is superdense coding used in quantum communication?
In other words, we can say it is a protocol that destroys the quantum state of a qubit in one location and recreates it on a qubit at a distant location, with the help of shared entanglement. Superdense coding is a procedure that allows someone to send two classical bits to another party using just a single qubit of communication.
How does superdense coding transfer two classical bits?
Superdense coding is a mechanism where we can transfer two classical bits of information by transferring only a single qubit between the sender and the receiver. Even thought a single qubit is transferred, we need a pair of entangled qubits shared between the sender and receiver in the beginning.
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