منابع مشابه
Quantum dense coding by spatial state entanglement
We have presented a theoretical extended version of dense coding protocol using entangled position state of two particles shared between two parties. A representation of Bell states and the required unitary operators are shown utilizing symmetric normalized Hadamard matrices. In addition, some explicit and conceivable forms for the unitary operators are presented by using some introduced basic ...
متن کاملDense coding and safety of quantum communications
Safety of quantum communications is, in the first place, the result of the quantum nature of the signal, sending by the sender Alice to the receiver Bob [1], [2], [3]. But when we discuss the safety of the quantum communications as a whole we have to take into account all objects taking place in the process of creation and communication of information. One of such object is the sending station,...
متن کاملQuantum Dense Coding Exploiting Bright EPR Beam
Highly efficient quantum dense coding for continuous variables has been experimentally accomplished by means of exploiting bright EPR beam with anticorrelation of amplitude quadratures and correlation of phase quadratures, which is generated from a nondegenerate optical parametric amplifier operating in the state of deamplification. Two bits of classical information are encoded on two quadratur...
متن کاملQuantum dense coding using three qubits
We consider a situation in which two parties, Alice and Bob, share a 3-qubit system coupled in an initial maximally entangled, GHZ state. By manipulating locally two of the qubits, Alice can prepare any one of the eight 3-qubit GHZ states. Thus the sending of Alice’s two qubits to Bob, entails 3 bits of classical information which can be recovered by Bob by means of a measurement distinguishing...
متن کاملOn quantum advantage in dense coding
The quantum advantage of dense coding is studied, considering general encoding quantum operations. Particular attention is devoted to the case of many senders, and it is shown that restrictions on the possible operations on the senders’ side may make some quantum state useless for dense-coding. It is shown, e.g., that some states are useful for dense coding if the senders can communicate classi...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2004
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.93.210501