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      Simultaneous Unbalanced Shared Local Oscillator Heterodyne Interferometry (SUSHI) for high SNR, minimally destructive dispersive detection of time-dependent atomic spins

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          Abstract

          We demonstrate "Simultaneous Unbalanced Shared Local Oscillator Heterodyne Interferometry (SUSHI)," a new method for minimally destructive, high SNR dispersive detection of atomic spins. In SUSHI a dual-frequency probe laser interacts with atoms in one arm of a Mach-Zehnder interferometer, then beats against a bright local oscillator beam traversing the other arm, resulting in two simultaneous, independent heterodyne measurements of the atom-induced phase shift. Measurement noise due to mechanical disturbances of beam paths is strongly rejected by the technique of \emph{active subtraction} in which anti-noise is actively written onto the local oscillator beam via an optical phase-locked-loop. In SUSHI, technical noise due to phase, amplitude, and frequency fluctuations of the various laser fields is strongly rejected (i) for any mean phase bias between the interferometer arms, (ii) without the use of piezo actuated mirrors, and (iii) without signal balancing. We experimentally demonstrate an ultra-low technical noise limited sensitivity of 51 nrad\(/\sqrt{\R{Hz}}\) over a measurement bandwidth of 60 Hz to 8 kHz using a 230 \(\mu\)W probe, and stay within \(\sim\)3 dB of the standard quantum limit as probe power is reduced by more than 5 orders of magnitude to as low as 650 pW. SUSHI is therefore well suited to performing QND measurements for preparing spin squeezed states and for high SNR, truly continuous observations of ground-state Rabi flopping in cold atom ensembles.

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          Most cited references16

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          Direct, Nondestructive Observation of a Bose Condensate

          The spatial observation of a Bose condensate is reported. Dispersive light scattering was used to observe the separation between the condensed and normal components of the Bose gas inside a magnetic trap. This technique is nondestructive, and about a hundred images of the same condensate can be taken. The width of the angular distribution of scattered light increased suddenly at the phase transition.
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            Phase and amplitude uncertainties in heterodyne detection

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              Fundamental quantum limit in precision phase measurement

              Z. Ou (1997)
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                Author and article information

                Journal
                2013-07-10
                2013-07-12
                Article
                10.1364/JOSAB.30.002409
                1307.2820
                32a0c076-780e-48b1-8ce3-d0dfa41f7977

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                13 pages, 7 figures
                physics.atom-ph

                Atomic & Molecular physics
                Atomic & Molecular physics

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