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We study the nature of entanglement in presence of Deutschian closed timelike curves (D-CTCs) and open timelike curves (OTCs) and find that existence of such physical systems in nature would allow us to increase entanglement using local operations and classical communication (LOCC). This is otherwise in direct contradiction with the fundamental definition… (More)
After this column I am resigning as SIGACT News Book Review Editor. I've been editing this column for 17 years which is longer than anyone should have a job of this type. I have enjoyed editing this column and reviewing books. I have enjoyed getting to know publishers and authors and reviewers. I have enjoyed getting books in the mail that I want to read. I… (More)
We study controlled quantum secure direct communication (CQSDC), a cryptographic scheme where a sender can send a secret bit-string to an intended recipient, without any secure classical channel, who can obtain the complete bit-string only with the permission of a controller. We report an efficient protocol to realize CQSDC using Cluster state and then go… (More)
algorithm design manual solutions algorithm design manual skiena algorithm design manual steven skiena39s the algorithm design manual pdf steven steven curtis chapman book steven nahmias solution manual chemistry steven. The Algorithm Design Manual: Solutions for selected exercises/problems an answer key to aid self-study with Steven Skiena's The Algorithm… (More)
A semi-blind watermarking scheme is presented based on Singular Value Decomposition (SVD), which makes essential use of the fact that, the SVD subspace preserves significant amount of information of an image and is a one way decomposition. The principal components are used, along with the corresponding singular vectors of the watermark image to watermark… (More)
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