A hybrid quantum-classical method computes accurate Green's functions for the pairing model across the normal-to-superfluid transition by combining variational ground-state preparation with quantum subspace expansion for neighboring particle numbers.
Here we use the simple state where only the lowest energy levels are oc- cupied, which in term of qubits reads as |φ0⟩ = |1 · · ·10 · · ·0⟩
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Quantum simulations of Green's functions for small superfluid systems
A hybrid quantum-classical method computes accurate Green's functions for the pairing model across the normal-to-superfluid transition by combining variational ground-state preparation with quantum subspace expansion for neighboring particle numbers.