Projects per year

### Abstract

Proposals for linear optical quantum computation (LOQC) rely on quantum interference between single photons which, when coupled with photon detection, provides a mechanism to generate photonic entanglement. However, ideal quantum interference between photons only occurs if the photons are completely indistinguishable in all degrees of freedom except the one being interfered. In practice, no photons will be perfectly indistinguishable and therefore it is important to understand how using partially-distinguishable photons will affect the quantum information within the linear optical quantum computer.

Here we describe how states of partially-distinguishable photons are transformed by linear-optical networks and measured by photon-counting detectors. In addition we show how to calculate the logical content of a given photonic state containing partially-distinguishable photons. Using a realistic model of single photon sources, we then apply these tools to calculate the resulting logical error rates on recent proposals for universal LOQC.

Understanding the connection between physical imperfections and logical errors is crucial in assessing the fault-tolerance prospects of a quantum computation platform. Our results will help inform error correction strategies and allow one to specify the necessary fabrication and operational tolerances required for scalability.

Here we describe how states of partially-distinguishable photons are transformed by linear-optical networks and measured by photon-counting detectors. In addition we show how to calculate the logical content of a given photonic state containing partially-distinguishable photons. Using a realistic model of single photon sources, we then apply these tools to calculate the resulting logical error rates on recent proposals for universal LOQC.

Understanding the connection between physical imperfections and logical errors is crucial in assessing the fault-tolerance prospects of a quantum computation platform. Our results will help inform error correction strategies and allow one to specify the necessary fabrication and operational tolerances required for scalability.

Original language | English |
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Publication status | Accepted/In press - 2016 |

Event | Photon 16 - University of Leeds, Leeds, United Kingdom Duration: 5 Sep 2016 → 8 Sep 2016 |

### Conference

Conference | Photon 16 |
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Country | United Kingdom |

City | Leeds |

Period | 5/09/16 → 8/09/16 |

## Fingerprint Dive into the research topics of 'Distinguishability Errors in Linear Optical Quantum Computing'. Together they form a unique fingerprint.

## Projects

## A practical quantum simulator: simulating molecular vibrations with photons. ECF

Engineering and Physical Sciences Research Council

1/11/15 → 31/10/20

Project: Research

## Cite this

Sparrow, C. (Accepted/In press).

*Distinguishability Errors in Linear Optical Quantum Computing*. Abstract from Photon 16, Leeds, United Kingdom.