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Multi-Database Quantum Symmetric Private Information Retrieval without Shared Randomness
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==Notation== <!-- Connects the non-mathematical outline with further sections. --> * <math>k</math>: number of servers involved in the protocol. * <math>n</math>: number of database elements. * <math>x</math>: database; this is an <math>n</math> bit string. * <math>i</math>: index of the desired database element, <math>x_i</math>. * <math>r</math>: random string. * <math>t</math>: length of a query bit string (sent by the user to one of the <math>k</math> servers). * <math>a</math>: length of an answer bit string (sent by one of the <math>k</math> servers to the user). * <math>a_j</math>: classical answer of the <math>j^\text{th}</math> server in [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.79.549&rep=rep1&type=pdf Beimel et al classical PIR scheme]. * <math>b_j</math>: combined with the <math>a_j</math>’s, the <math>b_j</math>’s (which are known only to the user) allow the user to reconstruct the desired database element at the end of [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.79.549&rep=rep1&type=pdf Beimel et al protocol]. <!--==Knowledge Graph==--> <!-- Add this part if the protocol is already in the graph --> <!--{{graph}}-->
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