Feasible Optical Weak Measurements of Complementary Observables via a Single Hamiltonian
نویسندگان
چکیده
منابع مشابه
Feasible optical weak measurements of complementary observables via a single Hamiltonian.
A general formalism for joint weak measurements of a pair of complementary observables is given. The standard process of optical three-wave mixing in a nonlinear crystal (such as in parametric down-conversion) is suitable for such tasks. To obtain the weak value of a variable A one performs weak measurements twice, with different initial states of the meter field. This seems to be a drawback, b...
متن کاملMeasuring Incompatible Observables Through Sequential Weak Measurements
Measurements are the very basis of Physics. In quantum mechanics they assume even a more fundamental role since observables can have undetermined values that “collapse” on a specific one only when a strong measurement (described by a projection operator) is done. Furthermore, a crucial feature of quantum measurement is that measuring one observable completely erases the information on the corre...
متن کاملState tomography via weak measurements
Recent work has revealed that the wave function of a pure state can be measured directly and that complementary knowledge of a quantum system can be obtained simultaneously by weak measurements. However, the original scheme applies only to pure states, and it is not efficient because most of the data are discarded by post-selection. Here, we propose tomography schemes for pure states and for mi...
متن کاملCovariance of Weak Lensing Observables
Analytical expressions for covariances of weak lensing statistics related to the aperture mass Map are derived for realistic survey geometries such as SNAP for a range of smoothing angles and redshift bins. We incorporate the contributions to the noise due to the intrinsic ellipticity distribution and the effects of finite size of the catalogue. Extending previous results to the most general ca...
متن کاملEntanglement amplification via local weak measurements
We propose a measurement-based method to produce a maximally-entangled state from a partially-entangled pure state. Our goal can be thought of as entanglement distillation from a single copy of a partially-entangled state. The present approach involves local two-outcome weak measurements. We show that the application of these local weak measurements leads to a probabilistic amplification of ent...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2012
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.108.080403