Protecting quantum modes in optical fibres

• URL: http://arxiv.org/abs/2305.11220v1
• Date: Thu, 18 May 2023 18:00:02 GMT
• Title: Protecting quantum modes in optical fibres
• Authors: M. A. T. Butt, P. Roth, G. K. L. Wong, M. H. Frosz, L. L. Sanchez-Soto, E. A. Anashkina, A. V. Andrianov, P. Banzer, P. S. J. Russell, G. Leuchs
• Abstract summary: We present a new scheme that allows for using polarization encoding in a fiber not only in the discrete, but also in the continuous-variable regime. For the example of a helically twisted photonic-crystal fibre, we experimentally demonstrate that using appropriate nonorthogonal modes, the polarization-preserving fiber does not fully scramble these modes over the full Poincar'e sphere. This will allow for more efficient measurements of quantum excitations in nonorthogonal modes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Polarization-preserving fibers maintain the two polarization states of an orthogonal basis. Quantum communication, however, requires sending at least two nonorthogonal states and these cannot both be preserved. We present a new scheme that allows for using polarization encoding in a fiber not only in the discrete, but also in the continuous-variable regime. For the example of a helically twisted photonic-crystal fibre, we experimentally demonstrate that using appropriate nonorthogonal modes, the polarization-preserving fiber does not fully scramble these modes over the full Poincar\'e sphere, but that the output polarization will stay on a great circle; that is, within a one-dimensional protected subspace, which can be parametrized by a single variable. This will allow for more efficient measurements of quantum excitations in nonorthogonal modes.

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