Breaking the Heisenberg limit with inefficient detectors
نویسندگان
چکیده
منابع مشابه
Alternating Linear Heisenberg Antiferromagnet: The Exciton Limit
The one-dimensional alternating antiferromagnet with H=2JΣnS⃗ 2n⋅S⃗2n−1+2J′ΣnS⃗2n⋅S⃗2n+1 is studied for J′≪J. For β−1≡kBT≪J the susceptibility is expanded in powers of the exciton density as χT∝ A (βJ′, J′/J)e−2βJ + B(βJ′,J′/J)e−4βJ+⋯ and the coefficients A and B are calculated for J′/J→0. The calculation of B(βJ′,0) required the evaluation of the two-exciton scattering matrix. The interactions bet...
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15 صفحه اولQuantum Kalman filtering and the Heisenberg limit in atomic magnetometry.
The shot-noise detection limit in current high-precision magnetometry [Nature (London) 422, 596 (2003)] is a manifestation of quantum fluctuations that scale as 1/sqrt[N] in an ensemble of N atoms. Here, we develop a procedure that combines continuous measurement and quantum Kalman filtering [Rep. Math. Phys. 43, 405 (1999)]] to surpass this conventional limit by exploiting conditional spin squ...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2005
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.72.045801