Tesis doctorales: TESEO

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Ministerio de Universidades - Gobierno de España

Título: EFFICIENT INFORMATION RECONCILIATION FOR QUANTUM KEY DISTRIBUTION
Autor: MARTÍNEZ MATEO, JESÚS
Universidad: Universidad Politécnica de Madrid
Departamento: FACULTAD DE INFORMÁTICA (DOCTORADOS NUEVOS)
Fecha de Lectura: 19/12/2011
Programa de doctorado: Software y Sistemas
Dirección:
- MARTÍN AYUSO, VICENTE (Director)
Tribunal:
- MARTÍN-DELGADO ALCÁNTARA, MIGUEL ÁNGEL (presidente)
- SALAS PERALTA, PEDRO JESÚS (secretario)
- POPPE, ANDREAS (vocal)
- BURG, ANDREAS (vocal)
- ZBINDEN, HUGO (vocal)
Descriptores:
- TECNOLOGIA DE LAS TELECOMUNICACIONES
- TEORIA DE LA INFORMACION
- CODIGO Y SISTEMAS DE CODIFICACION
Marcador: https://www.educacion.gob.es/teseo/mostrarRef.do?ref=948618Añadir a favoritos.
Resumen:
Advances in modern cryptography for secret-key agreement are driving the development of new methods and techniques in key distillation. Most of these developments, focusing on information reconciliation and privacy amplification, are for the direct benefit of quantum key distribution (QKD). In this context, information reconciliation has historically been done using heavily interactive protocols, i.e. with a high number of channel communications, such as the well-known Cascade. In this work we show how modern coding techniques can improve the performance of these methods for information reconciliation in QKD. Here, we propose the use of low-density parity-check (LDPC) codes, since they are good both in efficiency and throughput. A price to pay, a priori, using LDPC codes is that good efficiency is only attained for very long codes and in a very narrow range of error rates. This forces to use several codes in cases when the error rate varies significantly in different uses of the channel, a common situation for instance in QKD. To overcome these problems, this study examines various techniques for adapting LDPC codes, thus reducing the number of codes needed to cover the target range of error rates. These techniques are also used to improve the average efficiency of short-length LDPC codes based on a feedback coding scheme. The importance of short codes lies in the fact that they can be used for high throughput hardware implementations. In a further advancement, a protocol is proposed that avoids the a priori error rate estimation required in other approaches. This blind protocol also brings interesting implications to the finite key analysis.

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