A paired dual-squeezer Mach-Zehnder interferometer reaches Heisenberg-limited phase sensitivity with direct photon-number-difference detection by overcoming the equal-intensity divergence of standard squeezed-vacuum schemes.
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A three-stage adaptive method using locally informationally complete Fisher-symmetric measurements estimates pure states with O(d/N) error scaling and infidelity close to the Gill-Massar lower bound using 7d-3 outcomes.
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Toward Heisenberg-Limited Interferometry with Dual Squeezers
A paired dual-squeezer Mach-Zehnder interferometer reaches Heisenberg-limited phase sensitivity with direct photon-number-difference detection by overcoming the equal-intensity divergence of standard squeezed-vacuum schemes.
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Near-optimal pure state estimation with adaptive Fisher-symmetric measurements
A three-stage adaptive method using locally informationally complete Fisher-symmetric measurements estimates pure states with O(d/N) error scaling and infidelity close to the Gill-Massar lower bound using 7d-3 outcomes.