Optical Amplifier for Quantum Communication Systems

Abstract

In this thesis, a model for single photon amplification based on cluster-state quantum computation is proposed. A rescaling of the probability amplitudes of a deteriorated qubit in favor of the onephoton component will define the amplifier’s gain. Unlike the heralded quantum amplifiers, the probabilistic success of the whole process will not depend on the successful detection of a heralding signal. Instead, the whole procedure will rely upon a single-qubit measurement, thus excluding the need for photon-number resolving detectors. Our device also showed the ability to correct errors, which is a quality that is lacking in the Noiseless Linear Amplifiers, since we can not operate on annihilated vacuum states. The proposed model can be used to amplify qubits in long-distance quantum communication networks.