0 votes
asked by (170 points)

Hello Everyone,
In the tutorial page
http://itensor.org/docs.cgi?page=tutorials/correlations
I can know how to measure < | Sz2 * Sz4| >

I met a difficult in measurement of multi-site correlation such as
Sz2Sz4Sz6*Sz8 for the length of chain at N=10;

In the tutorial page
the last step is
il = commonIndex(psi.A(4),psi.A(3),Link);
C *= dag(prime(prime(psi.A(4),Site),il));

The most right dotted line will be become solid (contracted).
Then C becomes number

I tried to contract psi.A(5) and its prime and then add Sz6 *Sz8 etc.
But failed.
Could someone give any suggestions?
Thank you in advance.
Wz

commented by (170 points)
For N=4
C=psi.A(1)*Sz_1*dag(prime(psi.A(1),Site,Link));
C*= psi.A(2)*Sz_2*dag(prime(psi.A(2),Site,Link));
C*=psi.A(3)*Sz_3*dag(prime(psi.A(3),Site, Link));
C*=psi.A(4)*Sz_4*dag(prime(psi.A(4),Site,Link));
print ("==========S1S2S3S4=============","\n");
print (C,"\n");
It is ok.

I still don't know how to deal with Sz2*Sz4*Sz6 or Sz2*Sz4*Sz6*Sz8
commented by (170 points)
Inserting  unit operators in the operator chain   like Sz2*I3*Sz4*I5*Sz6   works now. Thanks.

1 Answer

0 votes
answered by (30.7k points)

Thanks very much for posting a solution, and glad you figured it out!

For those looking for the answer, please see the above comments by the original poster ^

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