Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Quantum tomographic cryptography with Bell diagonal states: nonequivalence of classical and quantum distillation protocols

Kaszlikowski, D and Lim, J Y and Oi, D K L and Willeboordse, F H and Gopinathan, A and Kwek, L C (2005) Quantum tomographic cryptography with Bell diagonal states: nonequivalence of classical and quantum distillation protocols. Physical Review A, 71 (1). -. ISSN 1094-1622

[img]
Preview
PDF
0408088v2.pdf - Preprint

Download (204kB) | Preview

Abstract

We present a generalized tomographic quantum key distribution protocol in which the two parties share a Bell diagonal mixed state of two qubits. We show that if an eavesdropper performs a coherent measurement on many quantum ancilla states simultaneously, classical methods of secure key distillation are less effective than quantum entanglement distillation protocols. We also show that certain classes of Bell diagonal states are resistant to any attempt at incoherent eavesdropping.