The control of individual quantum systems is now a reality in a variety of physical settings.
Feedback control is an important class of control methods because of its ability to reduce the …

Quantum metrology utilizes nonclassical resources, such as entanglement or squeezed
light, to realize sensors whose performance exceeds that afforded by classical-state …

Adaptive techniques have great potential for wide application in enhancing the precision of
quantum parameter estimation. We present an adaptive quantum state tomography protocol …

A goal of the emerging field of quantum control is to develop methods for quantum
technologies to function robustly in the presence of noise. Central issues are the …

We present a broad summary of research involving the application of quantum feedback
control techniques to optical setups, from the early enhancement of optical amplitude …

Reducing the average resource consumption is the central quest in discriminating non-
orthogonal quantum states for a fixed admissible error rate ϵ. The globally optimal fixed …

It is a central fact in quantum mechanics that non-orthogonal states cannot be distinguished
perfectly. In general, the optimal measurement for distinguishing such states is a collective …

We investigate schemes for Hamiltonian parameter estimation of a two-level system using
repeated measurements in a fixed basis. The simplest (Fourier based) schemes yield an …

We provide rigorous, efficiently computable and tight bounds on the average error
probability of multiple-copy discrimination between qubit mixed states by local operations …

Spectator qubits (SQs) are a tool to mitigate noise in hard-to-access data qubits. The SQ,
designed to be much more sensitive to the noise, is measured frequently, and the …