Quantum coins

One of the earliest cryptographic applications of quantum information was to create quantum digital cash that could not be counterfeited. In this paper, we describe a new type of quantum money: quantum coins, where all coins of the same denomination are represented by identical quantum states. We state desirable security properties such as anonymity and unforgeability and propose two candidate quantum coin schemes: one using black box operations, and another using blind quantum computation.

Lessons on sin and forgiveness : a crisis in the Roman Catholic Church

One of the greatest challenges facing the Roman Catholic Church (the Church) across the world continues to be found in addressing complaints of child sexual abuse (csa) by clergy. The list of Catholic clergy in Australia who have been criminally processed for sexual offences against children is disturbingly long. As disturbing as this list is, more disturbing are the accounts of clergy who have not been criminally prosecuted, but protected within the cloister of the Church. It is increasingly recognised that the significant difficulty with child sexual abuse in Catholic Churches, in particular, has not been the presence of perpetrators but the response of Church leadership to allegations of csa by clergy. Those who have faced criminal charges have often done so due to the resilience of victim/survivors and not because of the support of Church structures or culture. The Church has been slow to come to terms with the realities of the perpetration of csa by its clergy and even slower to recognise the need to prioritise victims in any effective, just response. The church has been slowest of all recognising that there are significant cultural and discursive challenges to confront in addressing the management of csa by clergy. There is, however, progressive recognition of the role that discursive constructs of forgiveness have played in perpetuating the crises and ultimately in perpetuating abuse. The institutional praxis of forgiveness can be demonstrated not only in the Church, but in lessons learned from use of forgiveness as an institutional response to mass violations of human rights. This paper explores the juncture between criminality, church culture and forgiveness in responding to csa by clergy.

Confronting expectation in grade 4: Tossing two coins

This study focuses on the experiences of 91 Grade 4 students who had been introduced to expectation and variation through trials of tossing a single coin many times. They were then given two coins to toss simultaneously and asked to state their expectation of the chances for the possible outcomes, in a similar manner expressed for a single coin. This paper documents the journey of the students in discovering that generally their initial expectation for two coins was incorrect and that despite variation, a large number of tosses could confirm a new expectation.