Remote preparation of quantum states

Remote state preparation is the variant of quantum state teleportation in which the sender knows the quantum state to be communicated. The original paper introducing teleportation established minimal requirements for classical communication and entanglement but the corresponding limits for remote state preparation have remained unknown until now: previous work has shown, however, that it not only requires less classical communication but also gives rise to a tradeoff between these two resources in the appropriate setting. We discuss this problem from first principles, including the various choices one may follow in the definitions of the actual resources. Our main result is a general method of remote state preparation for arbitrary states of many qubits, at a cost of 1 bit of classical communication and 1 bit of entanglement per qubit sent. In this "universal" formulation, these ebit and cbit requirements are shown to be simultaneously optimal by exhibiting a dichotomy. Our protocol then yields the exact tradeoff curve for memoryless sources of pure states (including the case of incomplete knowledge of the ensemble probabilities), based on the recently established quantum-classical tradeoff for visible quantum data compression. A variation of that method allows us to solve the even more general problem of preparing entangled states between sender and receiver (i.e., purifications of mixed state ensembles). The paper includes an extensive discussion of our results, including the impact of the choice of model on the resources, the topic of obliviousness, and an application to private quantum channels and quantum data hiding.     

Assessing the impact of human factors on data processing inspection errors

A study carried out in a large DP organization designed to identify and rank the human factors that have the greatest impact on the occurrence of inspection erros in reported. The study included the following steps: identification of relevant human factors based on the published literature on the subject; measurement of the contribution of each human factor to the various types of errors included in the study; and ranking the human factors according to their impact on the total number of errors, based on a model that ties together extent of contribution, error rates and product volume. An analysis of the sensitivity of the model to some ot its assumptions is also provided.     

Surgical interventions in acute pancreatitis

Results of treatment of 240 patients with an acute pancreatitis are adduced. Of them 42 (17,5%) were operated on. In 6 patients an acute edema of pancreas was revealed (one patient have died), in 36--destructive forms of an acute pancreatitis, 8 (22%) died. Results of treatment of patients, operated on in one week after disease beginning, were the best.     

Aeronika-NO2 and Aeronika-SO2 primary-standard gas-analysis suites

Translated from Izmeritel'naya Tekhnika, No. 10, pp. 50–52, October, 1988.     

Algorithms of Nondifferentiable Optimization: Development and Application

A brief survey of nondifferentiable optimization methods developed at the Institute of Cybernetics is presented: the subgradient method, the subgradient method with space dilatation in the subgradient direction, and the r-algorithm. Applications of nondifferentiable optimization methods are considered.     

A colloid-chemical model for the tendency of oils to form high-temperature deposits

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 15–17, May, 1992.