Multiparticle Bell's inequalities involving many measurement settings

We present a prescription for obtaining Bell's inequalities for N>2 observers involving more than two alternative measurement settings. We give examples of some families of such inequalities. The inequalities are violated by certain classes of states for which all standard Bell's inequalities with two measurement settings per observer are satisfied.Comment: 4 pages, RevTeX

From Cooperative Scans to Predictive Buffer Management

In analytical applications, database systems often need to sustain workloads with multiple concurrent scans hitting the same table. The Cooperative Scans (CScans) framework, which introduces an Active Buffer Manager (ABM) component into the database architecture, has been the most effective and elaborate response to this problem, and was initially developed in the X100 research prototype. We now report on the the experiences of integrating Cooperative Scans into its industrial-strength successor, the Vectorwise database product. During this implementation we invented a simpler optimization of concurrent scan buffer management, called Predictive Buffer Management (PBM). PBM is based on the observation that in a workload with long-running scans, the buffer manager has quite a bit of information on the workload in the immediate future, such that an approximation of the ideal OPT algorithm becomes feasible. In the evaluation on both synthetic benchmarks as well as a TPC-H throughput run we compare the benefits of naive buffer management (LRU) versus CScans, PBM and OPT; showing that PBM achieves benefits close to Cooperative Scans, while incurring much lower architectural impact.Comment: VLDB201

Minding the Gap: Building Equitable, Accessible, and Sustainable Prison Education Programs in Pennsylvania

The reinstatement of Pell grant eligibility for incarcerated individuals marks a pivotal moment in the landscape of higher education in prison (HEP) programming in the United States. However, despite this promising development, financial barriers persist, hindering the growth and sustainability of HEP initiatives. This qualitative study delves into the challenges faced by faculty, staff, and administrators within Pennsylvania\u27s colleges and universities as they establish and operate HEP programs amidst an evolving funding environment. Drawing on interviews with nine HEP administrators across the state, we explore obstacles they confront, ranging from the Pell grant funding gap to logistical hurdles such as access to educational materials and technology. Moreover, demographic disparities and security concerns emerge as significant factors impacting the relationship between HEP programs and the Pennsylvania Department of Corrections (DOC). Our findings extend beyond financial constraints, revealing broader systemic barriers to equitable and accessible HEP programming. We provide potential policy solutions to address these multifaceted challenges and foster a more supportive institutional environment for post-secondary education in Pennsylvania\u27s carceral system

Quantum Cryptography using larger alphabets

Like all of quantum information theory, quantum cryptography is traditionally based on two level quantum systems. In this letter, a new protocol for quantum key distribution based on higher dimensional systems is presented. An experimental realization using an interferometric setup is also proposed. Analyzing this protocol from the practical side, one finds an increased key creation rate while keeping the initial laser pulse rate constant. Analyzing it for the case of intercept/resend eavesdropping strategy, an increased error rate is found compared to two dimensional systems, hence an advantage for the legitimate users to detect an eavesdropper.Comment: 12 pages, 2 (eps) figure