Jonas S. Neergaard-Nielsen, Yujiro Eto, Chang-Woo Lee, Hyunseok Jeong, Masahide Sasaki
Quantum superpositions of coherent states, often referred to as Schr\"odinger cat states, play an important role in fundamental tests of quantum theory and in quantum information processing and communication tasks, such as coherent-state quantum computing (CSQC), metrology, and quantum repeater. Optical cat states are now routinely generated in the laboratories. However, real use cases of these tasks have not yet been demonstrated. Here we demonstrate a basic CSQC protocol, where a cat state is used as an entanglement resource for teleporting a coherent state with an amplitude gain, extendable to coherent state qubits. We also show how this can be extended to a loss-tolerant quantum relay of multi-ary phase-shift keyed coherent states. These protocols could be useful both in optical and quantum communications.
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http://arxiv.org/abs/1211.6634
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