Quantum Private Information Retrieval from Coded Storage Systems

In the era of extensive data growth, robust and efficient mechanisms are needed to store and manage vast amounts of digital information, such as Data Storage Systems (DSSs). Concurrently, privacy concerns have arisen, leading to the development of techniques like Private Information Retrieval (PIR) to enable data access while preserving privacy. A PIR protocol allows users to retrieve information from a database without revealing the specifics of their query or the data they are accessing. With the advent of quantum computing, researchers have explored the potential of using quantum systems to enhance privacy in information retrieval. In a Quantum Private Information Retrieval (QPIR) protocol, a user can retrieve information from a database by downloading quantum systems from multiple servers, while ensuring that the servers remain oblivious to the specific information being accessed. This scenario offers a unique advantage by leveraging the inherent properties of quantum systems to provide enhanced privacy guarantees and improved communication rates compared to classical PIR protocols. In this thesis we consider the QPIR setting where the queries and the coded storage systems are classical, while the responses from the servers are quantum. This problem was treated by Song et al. for replicated storage and different collusion patterns. This thesis aims to develop QPIR protocols for coded storage by combining known classical PIR protocols with quantum communication algorithms, achieving enhanced privacy and communication costs. We consider different storage codes and robustness assumptions, and we prove that the achieved communication cost is always lower than the classical counterparts.Comment: This is the summary part of an article collection-based PhD thesi

Transanal endoscopic microsurgery: what indications in 2013?

Thanks to major advances in the field of surgical techniques and neoadjuvant chemoradiation therapy, along with more accurate pre-operative staging tools and the widespread introduction of population-based screening programs, treatment of rectal cancer has been evolving over the past few decades, moving towards a more tailored approach. This has brought a shift in the treatment algorithm of benign rectal lesions and selected early rectal cancers, for which today transanal endoscopic microsurgery (TEM) is accepted as an effective alternative to abdominal surgery. In 2013, topics of controversy are the role of TEM in the treatment of more advanced rectal cancers, in cases of complete pathological response after chemoradiation therapy and the role of TEM as a platform for single-port surgery and NOTES. This article reviews the current indications for TEM and the future perspectives of this approach in the treatment of rectal tumors

Poetics of Friction

What are the problems in our current lifeworld? And how can they be addressed, worked on (or even be solved)? What are the possibilities and difficulties of Performance Philosophy to contribute to reflections on the crisis-ridden, everyday situations we are in, with our very embodied existences, and with our thoughts, fears, hopes (and even prayers), inside and outside art and academia? Called by these questions, our panel attempts to collaboratively work on corresponding responses within a poetics of friction that is rehearsed, acted out, and tried out in a setting where forces come into play that resist relative motions of solid approaches and beliefs sliding against each other: Whereas the three panelists – a multimedia artist, a cultural theorist, and a philosopher – call with their spoken words, screened images and handout materials, the members of the audience respond to these calls: Like the wheel that needs the concrete surface against its rubber to spin in movement, or the piece of wood that needs the wooden stick rotating against its bark to spark a flame, members of Performance Philosophy need frictions with which both Performance artists and Philosophy scholars slide against each other to spin, to move, to carry on, to reflect, to struggle, to doubt, to aim, to spark flames of inspiration. While the sources of such an inspiration are manifold, three of them come into movement and display during the rehearsal: (1) excavation, (2) meaning, and (3) sense