Search found 4 matches

by Yucheng He
12 Jun 2022, 06:14
Forum: HowTos and FAQ for TeNPy
Topic: How to apply a quantum channel?
Replies: 2
Views: 1683

Re: How to apply a quantum channel?

Yeah, I am thinking about applying the dephasing channel to a single site and then considering the whole system's evolution afterward. That is, the whole system is no longer a pure state.
by Yucheng He
07 Jun 2022, 05:54
Forum: HowTos and FAQ for TeNPy
Topic: About the entropy growth in random unitary circuit
Replies: 2
Views: 1738

Re: About the entropy growth in random unitary circuit

Thank you Johannes, that helps a lot! : )
by Yucheng He
31 May 2022, 19:12
Forum: HowTos and FAQ for TeNPy
Topic: How to apply a quantum channel?
Replies: 2
Views: 1683

How to apply a quantum channel?

I wish to apply a series of quantum channels on a specific site. For example, consider a dephasing channel, it has the form that \rho\rarr(1-p)I\rho+pZ\rho Z , which means, for a density matrix, \rho =\pmatrix{a&b\\c&d}, it will has the form \pmatrix{a&(1-2p)b\\(1-2p)c&d}. How could ...
by Yucheng He
20 May 2022, 02:59
Forum: HowTos and FAQ for TeNPy
Topic: About the entropy growth in random unitary circuit
Replies: 2
Views: 1738

About the entropy growth in random unitary circuit

I am trying to simulate the entropy growth in Random Unitary Circuit. I start from an L=8 chain and got this plot. Each bond is less than ln(2)=0.69, 2*ln(2)=1.39, 3*ln(2)=2.08 and 4*ln(2)=2.77 plateaus at late times. (I have roughly 0.625, 1.30, 1.87, and 2.24) What cause this phenomenon? Is that b...