The statistical error in any estimation can be reduced by repeating the measurement and
averaging the results. The central limit theorem implies that the reduction is proportional to …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

Measurement underpins all quantitative science. A key example is the measurement of
optical phase, used in length metrology and many other applications. Advances in precision …

We analyze the role of entanglement among probes and with external ancillas in quantum
metrology. In the absence of noise, it is known that unentangled sequential strategies can …

We present a method for optimizing quantum circuits architecture, based on the notion of a
quantum comb, which describes a circuit board where one can insert variable subcircuits …

Quantum walk is one of the main tools for quantum algorithms. Defined by analogy to
classical random walk, a quantum walk is a time-homogeneous quantum process on a …

Advancements in physics are often motivated/accompanied by advancements in our
precision measurements abilities. The current generation of atomic and optical …

We present the theory of how to achieve phase measurements with the minimum possible
variance in ways that are readily implementable with current experimental techniques …

We discuss the implementation of an iterative quantum phase estimation algorithm with a
single ancillary qubit. We suggest using this algorithm as a benchmark for multiqubit …

A generic qubit unitary operator affected by depolarizing noise is duplicated and inserted in
a quantum switch process, realizing a superposition of causal orders. The characterization …