Randomized gap and amplitude estimation
نویسندگان
چکیده
منابع مشابه
Randomized gap and amplitude estimation
We provide a new method for estimating spectral gaps in low-dimensional systems. Unlike traditional phase estimation, our approach does not require ancillary qubits nor does it require well characterised gates. Instead, it only requires the ability to perform approximate Haar–random unitary operations, applying the unitary whose eigenspectrum is sought out and performing measurements in the com...
متن کاملQuantum Amplitude Amplification and Estimation
Consider a Boolean function χ : X → {0, 1} that partitions set X between its good and bad elements, where x is good if χ(x) = 1 and bad otherwise. Consider also a quantum algorithm A such that A|0〉 = ∑ x∈X αx|x〉 is a quantum superposition of the elements of X, and let a denote the probability that a good element is produced if A|0〉 is measured. If we repeat the process of running A, measuring t...
متن کاملAmplitude balanced PEF estimation
Inverse theory teaches us that the residual, or misfit function, should be weighted by the inverse covariance matrix of the noise. Because the covariance operator is often difficult to estimate, we can approximate it with a diagonal weight that can be more easily computed. This paper investigates the possible choices of weighting functions for the data residual when prediction-error filters are...
متن کاملEstimation and Compensation of Linear Amplitude Distortions
The estimation and the compensation of particular amplitude distortions, affecting the consumer-grade receivers in broadband satellite communications, are considered. We present a novel estimator, analytically derived by exploiting low-order polynomial approximations of the equivalent distortion filter, which is modeled as an exponential function of the frequency. In the bandwidth of practical ...
متن کاملThe non-forward BFKL amplitude and rapidity gap physics
We discuss the BFKL approach to processes with large momentum transferred through a rapidity gap. The Mueller and Tang scheme to the BFKL non-forward parton-parton elastic scattering amplitude at large t, is extended to include higher conformal spins. The new contributions are found to decrease with increasing energy, as follows from the gluon reggeisation phenomenon, and to vanish for asymptot...
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 A
سال: 2016
ISSN: 2469-9926,2469-9934
DOI: 10.1103/physreva.93.062306