Information communicated by entangled photon pairs

Abstract

A key goal of quantum communication is to determine the maximum number of bits shared between two quantum systems. An important example of this is in entanglement based quantum key distribution (QKD) schemes. A realistic treatment of this general communication problem must take account of the nonideal nature of the entanglement source and the detectors. The aim of this paper is to give such a treatment. We obtain analytic expression for the mutual information in terms of experimental parameters. The results are applied to communication schemes that rely on spontaneous parametric down conversion to generate entangled photons. We show that our results can be applied to tasks such as calculating the optimal rate of bits per photon in high dimensional time bin encoded QKD protocols (prior to privacy amplification). A key finding for such protocols is that by using realistic experimental parameters, one can obtain over 10 bits per photon. We also show how our results can be applied to characterize the capacity of a fibre array and to quantify entanglement using mutual information.

9 pages, 5 figures, accepted for publication in Phys Rev A

References in corpus (9)

• Quantum key distribution with entangled photon sources
• Full characterisation of the quantum spiral bandwidth of entangled biphotons
• Absolute emission rates of Spontaneous Parametric Down Conversion into single transverse Gaussian modes
• Spectral decomposition of entangled photons with an arbitrary pump
• Security bound of two-bases quantum key-distribution protocols using qudits
• Long-distance practical quantum key distribution by entanglement swapping
• Angular EPR paradox
• Maximum observable correlation for a bipartite quantum system
• Retrodictive fidelities for pure state postselectors

Cited by in corpus (8)

• Overcoming Noise in Entanglement Distribution
• Introduction to the Transverse Spatial Correlations in Spontaneous Parametric Down-Conversion through the Biphoton Birth Zone
• Increasing the dimension in high-dimensional two-photon orbital angular momentum entanglement
• Security of high-dimensional quantum key distribution protocols using Franson interferometers
• The information of high-dimensional time-bin encoded photons
• Mutually unbiased measurements for high-dimensional time-bin based photonic states
• Improved non-linear devices for quantum applications
• OpenFlow Arbitrated Programmable Network Channels for Managing Quantum Metadata