A probe qubit coupled to an XX-DM ancilla chain yields QFI temperature peaks whose number equals the chain's single-particle energy levels, up to N peaks for N qubits.
En- tanglement enhanced thermometry in the detection of the unruh effect,
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Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains
A probe qubit coupled to an XX-DM ancilla chain yields QFI temperature peaks whose number equals the chain's single-particle energy levels, up to N peaks for N qubits.