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The generator corresponds only to the unerased qubits, and is given by H =∑N−t i=1 Zi

The uncorrupted probe state is the pure state |ϕ1⟩⟨ϕ1|, when t qubits are erased, the resultant probe state is the density matrix ρ = Trt(|ϕ1⟩⟨ϕ1|)

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Robust quantum metrology with explicit symmetric states

quant-ph · 2019-08-06 · conditional · novelty 6.0

Explicit symmetric 'gnu' probe states from permutation-invariant codes provably retain Heisenberg scaling of quantum Fisher information under a constant number of erasure errors or a single dephasing error.

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  • Robust quantum metrology with explicit symmetric states quant-ph · 2019-08-06 · conditional · none · ref 2

    Explicit symmetric 'gnu' probe states from permutation-invariant codes provably retain Heisenberg scaling of quantum Fisher information under a constant number of erasure errors or a single dephasing error.