fix density matrix fidelity

[GiggleLiu]

• Fix density matrix fidelity
• Fix and stablize focused state fidelity.

[codecov[bot]]

Codecov Report

Merging #393 (df31ee9) into master (c073d7e) will increase coverage by 0.06%. The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   88.72%   88.79%   +0.06%     
==========================================
  Files          73       73              
  Lines        4347     4365      +18     
==========================================
+ Hits         3857     3876      +19     
+ Misses        490      489       -1     

Impacted Files	Coverage Δ
src/EasyBuild/block_extension/FSimGate.jl	68.42% <0.00%> (-3.81%)	:arrow_down:
src/EasyBuild/qft_circuit.jl	100.00% <ø> (ø)
lib/YaoArrayRegister/src/density_matrix.jl	96.42% <100.00%> (+0.59%)	:arrow_up:
lib/YaoArrayRegister/src/register.jl	98.06% <100.00%> (ø)
lib/YaoArrayRegister/src/utils.jl	86.15% <100.00%> (+1.49%)	:arrow_up:
lib/YaoBlocks/src/abstract_block.jl	88.77% <100.00%> (ø)
lib/YaoBlocks/src/composite/chain.jl	95.41% <100.00%> (ø)
lib/YaoBlocks/src/utils.jl	94.87% <100.00%> (+0.13%)	:arrow_up:
src/EasyBuild/google53.jl	74.60% <100.00%> (+0.40%)	:arrow_up:
src/EasyBuild/variational_circuit.jl	97.77% <100.00%> (+0.10%)	:arrow_up:
... and 3 more

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