Title: Quantum Journal Club: Degree Distribution in QuantumWalks on Complex Networks
Speaker: Chengran Yang Tsinghua University
Time: 2015-04-09 15:00-2015-04-09 16:00
Venue: CQI meeting room

Abstract:

In this theoretical study, we analyze quantum walks on complex networks, which model network-based processes ranging from quantum computing to biology and even sociology. Specifically, we analytically relate the average long-time probability distribution for the location of a unitary quantum walker to that of a corresponding classical walker. The distribution of the classical walker is proportional to the distribution of degrees, which measures the connectivity of the network nodes and underlies many methods for analyzing classical networks, including website ranking. The quantum distribution becomes exactly equal to the classical distribution when the walk has zero energy, and at higher energies, the difference, the socalled quantumness, is bounded by the energy of the initial state. We give an example for which the quantumness equals a Re´nyi entropy of the normalized weighted degrees, guiding us to regimes for which the classical degree-dependent result is recovered and others for which quantum effects dominate.



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