title: Experimental quantum-walk revival with a time-dependent coin.
abstract: We demonstrate a quantum walk with time-dependent coin bias. With this technique we realize an experimental single-photon one-dimensional quantum walk with a linearly ramped time-dependent coin flip operation and thereby demonstrate two periodic revivals of the walker distribution. In our beam-displacer interferometer, the walk corresponds to movement between discretely separated transverse modes of the field serving as lattice sites, and the time-dependent coin flip is effected by implementing a different angle between the optical axis of half-wave plate and the light propagation at each step. Each of the quantum-walk steps required to realize a revival comprises two sequential orthogonal coin-flip operators, with one coin having constant bias and the other coin having a time-dependent ramped coin bias, followed by a conditional translation of the walker.
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.|State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
authors.forename: P
authors.initials: P
authors.lastname: Xue
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: R
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: H
authors.initials: H
authors.lastname: Qin
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: X
authors.initials: X
authors.lastname: Zhan
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Bian
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|Shanghai Branch, CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.|Institute for Quantum Science and Technology, University of Calgary, Alberta T2N 1N4, Canada.|Program in Quantum Information Science, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.
authors.forename: Barry C
authors.initials: BC
authors.lastname: Sanders
mesh_terms: D008962:Models, Theoretical; D011789:Quantum Theory