TY - JOUR
T1 - Phase-modified CTQW unable to distinguish strongly regular graphs efficiently
AU - Mahasinghe, Anuradha
AU - Izaac, Josh
AU - Wang, Jingbo
AU - Wijerathna, J.K.
PY - 2015
Y1 - 2015
N2 - © 2015 IOP Publishing Ltd. Various quantum walk-based algorithms have been developed, aiming to distinguish non-isomorphic graphs with polynomial scaling, within both the discrete-time quantum walk (DTQW) and continuous-time quantum walk (CTQW) frameworks. Whilst both the single-particle DTQW and CTQW have failed to distinguish non-isomorphic strongly regular graph families (prompting the move to multi-particle graph isomorphism (GI) algorithms), the single-particle DTQW has been successfully modified by the introduction of a phase factor to distinguish a wide range of graphs in polynomial time. In this paper, we prove that an analogous phase modification to the single particle CTQW does not have the same distinguishing power as its discrete-time counterpart, in particular it cannot distinguish strongly regular graphs with the same family parameters with the same efficiency.
AB - © 2015 IOP Publishing Ltd. Various quantum walk-based algorithms have been developed, aiming to distinguish non-isomorphic graphs with polynomial scaling, within both the discrete-time quantum walk (DTQW) and continuous-time quantum walk (CTQW) frameworks. Whilst both the single-particle DTQW and CTQW have failed to distinguish non-isomorphic strongly regular graph families (prompting the move to multi-particle graph isomorphism (GI) algorithms), the single-particle DTQW has been successfully modified by the introduction of a phase factor to distinguish a wide range of graphs in polynomial time. In this paper, we prove that an analogous phase modification to the single particle CTQW does not have the same distinguishing power as its discrete-time counterpart, in particular it cannot distinguish strongly regular graphs with the same family parameters with the same efficiency.
U2 - 10.1088/1751-8113/48/26/265301
DO - 10.1088/1751-8113/48/26/265301
M3 - Article
VL - 48
SP - Article 265301
JO - Journal of Physics A : Mathematical and Theoretical
JF - Journal of Physics A : Mathematical and Theoretical
SN - 1751-8113
IS - 26
ER -