In the past 20 years, impressive progress has been made both experimentally and
theoretically in superconducting quantum circuits, which provide a platform for manipulating …

During the last ten years, superconducting circuits have passed from being interesting
physical devices to becoming contenders for near-future useful and scalable quantum …

Decoherence, often caused by unavoidable coupling with the environment, leads to
degradation of quantum coherence. For a multipartite quantum system, decoherence leads …

The length of time that a quantum system can exist in a superposition state is determined by
how strongly it interacts with its environment. This interaction entangles the quantum state …

Already in the first edition of this book [1], a great number of interesting and important
applications for Josephson junctions were discussed. In the decades that have passed since …

We show that qubit decoherence due to zero-temperature energy relaxation can be almost
completely suppressed by using the quantum uncollapsing (measurement reversal) …

Experimental progress is reviewed for superconducting phase qubit research at the
University of California, Santa Barbara. The phase qubit has a potential advantage of …

We realize indirect partial measurement of a transmon qubit in circuit quantum
electrodynamics by interaction with an ancilla qubit and projective ancilla measurement with …

This book adopts a novel, physics-first approach to quantum measurement, using physical
experiments as the basis to describe the underlying mathematical formalism. Topics covered …

We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement
on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of …