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It is revealed that quantum repeaters and quantum seals have a very close relationship, thus the theory in one field can be applied to the other. We give examples of novel results found by applying the existing theory of quantum seals on quantum repeater problem.
Quantum information science and atom optics are among the most active fields in modern physics. One of our main activities is to use atomic qubits as quantum memory and exploit photonic qubits for information transfer and processing to achieve efficient linear optics quantum information processing (QIP). On the one hand, utilizing the interaction between laser pulses and ultra-cold atomic ensembles...
We report progress in using spectral hole-burning in praseodymium doped Y2SiO5 to prepare an ensemble of Pr3+ ions with a spectral distribution optimized for use in a Duan-Lukin-Cirac-Zoller-type (DLCZ) quantum-repeater scheme.
We present a new control algorithm and system design for a network of quantum repeaters, and outline the end-to-end protocol architecture. Such a network will create long-distance quantum states, supporting quantum key distribution as well as distributed quantum computation. Quantum repeaters improve the reduction of quantum-communication throughput with distance from exponential to polynomial. Because...
The complex environment of solid-state quantum bits is generally believed to pose a difficult challenge for solid state realizations of quantum information science. Close study of single electronic spins associated with the nitrogen-vacancy (NV) center in diamond has shown how a complex environment -- in this case a spin-bath formed by carbon-13 isotopic impurities -- may be understood and even controlled...
The authors propose and demonstrate an atomic qubit based on a cold rubidium isotopic mixture, entangled with a frequency-encoded optical qubit. We discuss the use of such matter qubits in memory-insensitive multiplexed quantum repeaters.
We study optical coherence properties and Stark-shift based broadening of the 1.53 mum transition of an erbium doped telecommunication fiber. Our findings demonstrate its potential for quantum state storage as required for a quantum repeater
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