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Heralded noiseless amplification is a promising method to overcome the transmission photon loss in practical noisy quantum channel and can effectively lengthen the quantum communication distance. Single-photon entanglement is an important resource in current quantum communications. Here, we construct two single-photon-assisted heralded noiseless amplification protocols for the single-photon two-mode...
By the birth of Quantum Physics, many new areas were opened for research and development in the world of science and technology. One such field is Quantum Computing and Communication where there is room for all that was once a dream in the field of computing and communication. Ultra high speed, immunity to eavesdropping, security, and name it and it may be possible. This paper gives a brief review...
Polarization entangled photon pair sources based on either type-II or type-0 PPLN waveguides emitting at telecom wavelengths are presented. Implementation of such sources, associated high-quality entanglement, as well as related potential for future quantum applications are shown.
The implementation of quantum communication protocols in long optical fibers is limited by several decoherence mechanisms. In this contribution we review this mechanisms and analysis their effect on the quantum states. Because of asymmetry in the real fibers, the two orthogonal polarization modes are propagated at different phase and group velocities. The difference in group velocities results in...
We report characterization result using weak coherent pulses on four states polarization flipper utilizing two Pockels cells. Visibility of nearly 90% and above was achieved for each four linear polarization input states. A good polarization contrast between not flipped and flipped states shows that this configuration can be applied for single photon applications.
Based on single photons with random polarization angle, a deterministic secure bidirectional quantum communication scheme, which is similar to traditional communication mode, is proposed. In this scheme both checking messages and secret messages are encoded in the single photons rotated random polarization angle by performing a series of independent operations in three-way quantum channel. Security...
Atoms and photons are well-suited candidates for quantum information processing and quantum communication. While atoms can be used for storage and manipulation, photons are ideal carriers for the transfer of quantum information. Our group pursues the goal of creating a basic node of a quantum communication network by entangling two independently trapped &7Rb atoms over a large distance. Besides...
The term entanglement is used in quantum theory to describe the way that particles of energy/matter can become correlated and predictably interact with each other regardless of how far apart they are. In future quantum entanglement will dominate the way we look at information, the way we communicate secretly and the way our computers do their things. Much current research is focusing on how to harness...
We propose and demonstrate a postselection-free linear optical minimum disturbance measurement (MDM) device which optimally measures the polarization qubit of a single-photon with the help of an ancillary path qubit introduced to the same photon.
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