The paper defines covert quantum computing via quantum strategies, proves O(sqrt(n)) border qubits suffice for detection in planar n-qubit circuits with nearest-neighbor crosstalk, and experimentally detects additional long-range coupling on IQM Emerald and IBM Heron processors.
Signaling for covert quantum sensing
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The optimal input signal state for minimizing detectability in sparse covert signaling over bosonic channels is a mixture of two consecutive photon-number states, specifically vacuum and single photon in low-brightness regime.
citing papers explorer
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Toward Covert Quantum Computing
The paper defines covert quantum computing via quantum strategies, proves O(sqrt(n)) border qubits suffice for detection in planar n-qubit circuits with nearest-neighbor crosstalk, and experimentally detects additional long-range coupling on IQM Emerald and IBM Heron processors.
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Covert Signaling for Communication and Sensing over the Bosonic Channels
The optimal input signal state for minimizing detectability in sparse covert signaling over bosonic channels is a mixture of two consecutive photon-number states, specifically vacuum and single photon in low-brightness regime.