Experimental generation of four-mode continuous-variable cluster states

Yukawa, Mitsuyoshi; Ukai, Ryuji; Loock, Peter van; Furusawa, Akira

doi:10.1103/physreva.78.012301

Cited by 237 publications

(224 citation statements)

References 20 publications

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“…To achieve this the experiment required a frequency doubling cavity, a high finesse ring cavity used to seed a pair of OPOs, as well as two homodyne detector set-ups requiring phase control. More recently, another example of the complexity of quantum optics experiments is the work carried out by Yukawa et al in 2008 to generate four-mode cluster states for use in quantum computing [12]. This experiment required a frequency doubler, which was used to pump four OPOs, and four homodyne set-ups were required for the measurements.…”

Section: A Digital Control For Quantum Optics Experimentsmentioning

confidence: 99%

A scalable, self-analyzing digital locking system for use on quantum optics experiments

Sparkes

Chrzanowski

Parrain

et al. 2011

Review of Scientific Instruments

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Digital control of optics experiments has many advantages over analog control systems, specifically in terms of scalability, cost, flexibility, and the integration of system information into one location. We present a digital control system, freely available for download online, specifically designed for quantum optics experiments that allows for automatic and sequential re-locking of optical components. We show how the inbuilt locking analysis tools, including a white-noise network analyzer, can be used to help optimize individual locks, and verify the long term stability of the digital system. Finally, we present an example of the benefits of digital locking for quantum optics by applying the code to a specific experiment used to characterize optical Schrödinger cat states.

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Section: A Digital Control For Quantum Optics Experimentsmentioning

confidence: 99%

A scalable, self-analyzing digital locking system for use on quantum optics experiments

Sparkes

Chrzanowski

Parrain

et al. 2011

Review of Scientific Instruments

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“…We begin with a brief explanation of how one could distinguish that a given state belongs to the class of cluster states. Simply, a given state is quantified as a cluster state if the quadrature correlations are such that in the limit of infinite squeezing, the state becomes zero eigenstate of a set of quadrature combinations [124] …”

Section: Cluster States Of Atomic Ensemblesmentioning

confidence: 99%

Quantum entanglement and disentanglement of multi-atom systems

Ficek

2009

Front. Phys. China

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We present a review of recent research on quantum entanglement, with special emphasis on entanglement between single atoms, processing of an encoded entanglement and its temporary evolution. Analysis based on the density matrix formalism are described. We give a simple description of the entangling procedure and explore the role of the environment in creation of entanglement and in disentanglement of atomic systems. A particular process we will focus on is spontaneous emission, usually recognized as an irreversible loss of information and entanglement encoded in the internal states of the system. We illustrate some certain circumstances where this irreversible process can in fact induce entanglement between separated systems. We also show how spontaneous emission reveals a competition between the Bell states of a two qubit system that leads to the recently discovered "sudden" features in the temporal evolution of entanglement. An another problem illustrated in details is a deterministic preparation of atoms and atomic ensembles in long-lived stationary squeezed states and entangled cluster states. We then determine how to trigger the evolution of the stable entanglement and also address the issue of a steered evolution of entanglement between desired pairs of qubits that can be achieved simply by varying the parameters of a given system.

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“…CV systems have an advantage over DVs, as CV cluster states can be unconditionally prepared with squeezed light sources and beam splitters [15]. In addition, balanced homodyne detection is available as a deterministic measurement.…”

Section: Introductionmentioning

confidence: 99%

On-chip continuous-variable quantum entanglement

Masada

Furusawa

2016

Nanophotonics

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Entanglement is an essential feature of quantum theory and the core of the majority of quantum information science and technologies. Quantum computing is one of the most important fruits of quantum entanglement and requires not only a bipartite entangled state but also more complicated multipartite entanglement. In previous experimental works to demonstrate various entanglement-based quantum information processing, light has been extensively used. Experiments utilizing such a complicated state need highly complex optical circuits to propagate optical beams and a high level of spatial interference between different light beams to generate quantum entanglement or to efficiently perform balanced homodyne measurement. Current experiments have been performed in conventional free-space optics with large numbers of optical components and a relatively largesized optical setup. Therefore, they are limited in stability and scalability. Integrated photonics offer new tools and additional capabilities for manipulating light in quantum information technology. Owing to integrated waveguide circuits, it is possible to stabilize and miniaturize complex optical circuits and achieve high interference of light beams. The integrated circuits have been firstly developed for discrete-variable systems and then applied to continuous-variable systems. In this article, we review the currently developed scheme for generation and verification of continuous-variable quantum entanglement such as Einstein-Podolsky-Rosen beams using a photonic chip where waveguide circuits are integrated. This includes balanced homodyne measurement of a squeezed state of light. As a simple example, we also review an experiment for generating discrete-variable quantum entanglement using integrated waveguide circuits.

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Experimental generation of four-mode continuous-variable cluster states

Cited by 237 publications

References 20 publications

A scalable, self-analyzing digital locking system for use on quantum optics experiments

A scalable, self-analyzing digital locking system for use on quantum optics experiments

Quantum entanglement and disentanglement of multi-atom systems

On-chip continuous-variable quantum entanglement

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