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Achieving Heisenberg limit under General Markov Noise without Ancilla
We consider probing qubits infested by general Makovian noise. It can be
shown that one can restore Heisenberg limit (HL) via full and fast control
without any ancilla, as long as the Hamiltonian of the system has non-vanishing
component perpendicular to the noiseComment: 4 page
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