Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting

  title={Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting},
  author={Stephen D. Bartlett and Barry C. Sanders},
  journal={Physical Review A},
Although universal continuous-variable quantum computation cannot be achieved via linear optics (including squeezing), homodyne detection, and feed-forward, inclusion of ideal photon-counting measurements overcomes this obstacle. These measurements are sometimes described by arrays of beam splitters to distribute the photons across several modes. We show that such a scheme cannot be used to implement ideal photon counting and that such measurements necessarily involve nonlinear evolution… 

Photon counting schemes and performance of non-deterministic nonlinear gates in linear optics

The performance of nondeterministic nonlinear gates in linear optics relies on the photon counting scheme being employed and the efficiencies of the detectors in such schemes. We assess the

Efficient classical simulation of optical quantum information circuits.

This simulatability result places powerful constraints on the capability to realize exponential quantum speedups as well as on inducing an optical nonlinear transformation via linear optics, photodetection-based measurement, and classical feedforward of measurement results, optimal cloning, and a wide range of other processes.

Non-Gaussian states of light as an offline resource for universal continuous variable quantum information processing

We prove that continuous variable quantum information processing via Gaussian preserving operations, with Gaussian input states plus a (highly nonclassical) Fock number state, and subject to homodyne

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We design a scheme for detecting a single photon loss from multi-modal quantum signals transmitted via a fiber or in free space. This consists of a special type of unitary coding transformation, the

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Continuous‐variable quantum information processing

This paper is addressing the three main stages of a quantum information system; the preparation stage where quantum information is encoded into CVs of coherent states and single-photon states, the processing stage whereCV information is manipulated to carry out a specified protocol and a detection stage where CV information is measured using homodyne detection or photon counting.

Non-Gaussian ancilla states for continuous variable quantum computation via Gaussian maps

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Real-Time Quadrature Measurement of a Single-Photon Wave Packet with Continuous Temporal-Mode Matching.

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Applications of quantum Fourier transform in photon-added coherent state

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"Quantum Communication, Computing, and Measurement"

This volume brings together scientists working in the interdisciplinary fields of quantum communication science and technology on topics including quantum information theory, quantum computing, stochastic processes and filtering, and quantum measurement theory.


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