The Heisenberg Limit ·
Phase Estimation Beyond Shot Noise
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.com · N probes · Δφ ∝ 1/N vs 1/√N · quantum Fisher information
F
Q
—
Δφ
—
phase
—
Separable probes · SQL (1/√N)
Entangled GHZ/NOON state
Bloch sphere · collective spin
Heisenberg scaling (1/N)
Decoherence · loss reverts scaling
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.com · The Heisenberg Limit: Phase Estimation Beyond Shot Noise