Abstract
A Mach-Zender interferometer with a Gaussian number-difference squeezed input state can exhibit sub-shot-noise phase resolution over a large phase interval. We derive the optimal level of squeezing for a given phase interval Δθ0 and particle number N. We then propose an adaptive measurement sequence in which the amount of squeezing is increased with each measurement. With this scheme, any phase on (-Δθ0,Δθ0) can be measured with a precision of 3.5/N, requiring only 2-4 measurements, provided only that Ntan (Δθ0)<1040. In a double-well Bose-Einstein condensate, the optimized input states can be created by adiabatic manipulation of the ground state.
| Original language | English |
|---|---|
| Article number | 250406 |
| Journal | Physical Review Letters |
| Volume | 100 |
| Issue number | 25 |
| DOIs | |
| State | Published - 27 Jun 2008 |
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