Light-harvesting components of photosynthetic organisms are complex, coupled, many-body
quantum systems, in which electronic coherence has recently been shown to survive for
relatively long timescales, despite the decohering effects of their environments. Here, we …

The creation of a quantum network requires the distribution of coherent information across
macroscopic distances. We demonstrate the entanglement of two superconducting qubits,
separated by more than a meter of coaxial cable, by designing a joint measurement that …

It has been suggested that excitation transport in photosynthetic light-harvesting complexes
features speedups analogous to those found in quantum algorithms. Here we compare the
dynamics in these light-harvesting systems to the dynamics of quantum walks, in order to …

Several recent studies of energy transfer in photosynthetic light harvesting complexes have
revealed a subtle interplay between coherent and decoherent dynamic contributions to the
overall transfer efficiency in these open quantum systems. In this work we systematically …

We describe a scheme for quantum-error correction that employs feedback and weak
measurement rather than the standard tools of projective measurement and fast controlled
unitary gates. The advantage of this scheme over previous protocols [for example, Ahn et al …

Circuit QED is a promising solid-state quantum computing architecture. It also has excellent
potential as a platform for quantum control—especially quantum feedback control—
experiments. However, the current scheme for measurement in circuit QED is low efficiency …

We explore the task of optimal quantum channel identification and in particular, the
estimation of a general one-parameter quantum process. We derive new characterizations
of optimality and apply the results to several examples including the qubit depolarizing …

Adiabatic quantum computation (AQC) has been lauded for its inherent robustness to control
imperfections and relaxation effects. A considerable body of previous work, however, has
shown AQC to be acutely sensitive to noise that causes excitations from the adiabatically …

Many emerging quantum technologies demand precise engineering and control over
networks consisting of quantum mechanical degrees of freedom connected by propagating
electromagnetic fields, or quantum input-output networks. Here we review recent progress in …

We introduce a new continuous-variable quantum key distribution (CV-QKD) protocol, self-
referenced CV-QKD, that eliminates the need for transmission of a high-power local
oscillator between the communicating parties. In this protocol, each signal pulse is …