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When state has few terms compared with operator, faster to do direct… #173

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Nov 28, 2023
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When state has few terms compared with operator, faster to do direct… #173

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When state has few terms compared with operator, faster to do direct…
TimWeaving Nov 28, 2023
f35bac8
Expectation value is a real quantity
TimWeaving Nov 28, 2023
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19 changes: 11 additions & 8 deletions symmer/operators/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -829,16 +829,19 @@ def expval(self, psi: "QuantumState") -> complex:
Returns:
complex: The expectation value.
"""
if self.n_terms > 1:
@process.parallelize
def f(P, psi):
return single_term_expval(P, psi)

expvals = np.array(f(self, psi))
if self.n_terms > psi.n_terms:
return (psi.dagger * self * psi).real
else:
expvals = np.array(single_term_expval(self, psi))
if self.n_terms > 1:
@process.parallelize
def f(P, psi):
return single_term_expval(P, psi)

expvals = np.array(f(self, psi))
else:
expvals = np.array(single_term_expval(self, psi))

return np.sum(expvals * self.coeff_vec)
return np.sum(expvals * self.coeff_vec).real

def __mul__(self,
mul_obj: Union["PauliwordOp", "QuantumState", complex],
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