Single-shot quantum measurements sketch quantum many-body states

Near quantum-limited, single-shot coherent arbitrary optical waveform measurements.

Four-quadrature spectral interferometry using balanced coherent detection enables single-shot full-field characterization of complex-shaped optical waveforms with near quantum-limited sensitivity. A 90 degrees optical hybrid places a waveform in four-quadrature-phases with a stronger, well-characterized reference pulse. Measurement of the four spectra with an integrating two-dimensional detecto...

Adaptive single-shot phase measurements: The full quantum theory

The phase of a single-mode field can be measured in a single-shot measurement by interfering the field with an effectively classical local oscillator of known phase. The standard technique is to have the local oscillator detuned from the system ~heterodyne detection! so that it is sometimes in phase and sometimes in quadrature with the system over the course of the measurement. This enables bot...

Preparation of many-body states for quantum simulation.

While quantum computers are capable of simulating many quantum systems efficiently, the simulation algorithms must begin with the preparation of an appropriate initial state. We present a method for generating physically relevant quantum states on a lattice in real space. In particular, the present algorithm is able to prepare general pure and mixed many-particle states of any number of particl...

Topological Many-Body States in Quantum Antiferromagnets via Fuzzy Supergeometry

Recent vigorous investigations of topological order have not only discovered new topological states of matter but also shed new light to “already known” topological states. One established example with topological order is the valence bond solid (VBS) states in quantum antiferromagnets. The VBS states are disordered spin liquids with no spontaneous symmetry breaking but most typically manifest ...

Assessing the Nonequilibrium Thermodynamics in a Quenched Quantum Many-Body System via Single Projective Measurements