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- W2922247135 abstract "Motivated by recent studies of quantum computational complexity in quantum field theory and holography, we discuss how weighting certain classes of gates building up a quantum circuit more heavily than others does affect the complexity. Utilizing Nielsen's geometric approach to circuit complexity, we investigate the effects for a regulated field theory for which the optimal circuit is a representation of $GL(N,mathbb{R})$. More precisely, we work out how a uniformly chosen weighting factor acting on the entangling gates affects the complexity and, particularly, its divergent behavior. We show that assigning a higher cost to the entangling gates increases the complexity. Employing the penalized and the unpenalized complexities for the $mathcal{F}_{kappa=2}$ cost, we further find an interesting relation between the latter and the one based on the unpenalized $mathcal{F}_{kappa=1}$ cost. In addition, we exhibit how imposing such penalties modifies the leading order UV divergence in the complexity. We show that appropriately tuning the gate weighting eliminates the additional logarithmic factor, thus, resulting in a simple power law scaling. We also compare the circuit complexity with holographic predictions, specifically, based on the complexity=action conjecture, and relate the weighting factor to certain bulk quantities. Finally, we comment on certain expectations concerning the role of gate penalties in defining complexity in field theory and also speculate on possible implications for holography." @default.
- W2922247135 created "2019-03-22" @default.
- W2922247135 creator A5048053254 @default.
- W2922247135 date "2019-03-14" @default.
- W2922247135 modified "2023-09-27" @default.
- W2922247135 title "Weighting gates in circuit complexity and holography" @default.
- W2922247135 hasPublicationYear "2019" @default.
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