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Research Associate in Quantum Information Processing

Imperial College London

Location: London
Salary: £45,593 to £53,630
Hours: Full Time
Contract Type: Fixed-Term/Contract
Placed On: 19th February 2024
Closes: 17th March 2024
Job Ref: NAT01454
 

RUQu is seeking a talented and motivated postdoctoral research associate to undertake research in experimental photonic quantum information technologies with a focus on both near-term quantum computers such as Gaussian Boson Samplers, and forthcoming universal fault-tolerant photonic quantum computers. Notably, this project has garnered substantial support in the form of £1.97 million, courtesy of UK Research & Innovation and UK National Quantum Technologies programme funding. Moreover, this initiative will necessitate extensive collaboration with esteemed partners hailing from the realms of academia and industry. The position, initially available for a period of three years, holds the potential for extension, contingent upon the availability of additional funding.

A key challenge in quantum computing is dealing with errors that can arise from environmental noise or other sources. Error mitigation and correction strategies are essential to the development of practical quantum computing devices. In recent years, photonic quantum computing has emerged as a promising platform for quantum computing and demonstrating a genuine quantum advantage. Quantum states of light (QSoL) are robust to environmental noise and can be easily manipulated and measured using simple optical components at room temperature. Additionally, QSoL can be transmitted over long distances using optical fibres, which makes them an attractive option for quantum communication and networking.

Errors can arise from various factors, including imperfect state preparation, photon loss, and detector inefficiencies. The main source of error in photonic quantum information processing is due to photon loss which may occur due to mode-mismatch between media with dissimilar optical properties or imperfect fabrication of optical components. Thus, mitigating and correcting these errors is critical for the development of practical photonic quantum computers.

Error-mitigation techniques may involve modifying the quantum circuit to reduce the impact of errors on the computation or performing post-processing of the outcomes to infer what the error-free outcome should be. One approach to error-correction involves using quantum error-correcting codes (ECCs). ECCs involve encoding the quantum state in a larger Hilbert space, which is protected against certain types of errors. Bosonic ECCs utilise the full harmonic-oscillator nature of light meaning that a single QSoL can encode the logical information and still have the redundancy necessary for error-correction.

The successful applicant will perform experiments to demonstrate error mitigation and error-correction. The post holder will work as part of a team to 1) build high-gain squeezed light sources, 2) work with collaborators in industry and academia to mitigate loss in integrated photonic circuits, 3) investigate error mitigation and correction strategies for near-term and fault-tolerant photonic quantum computers, 4) study the suitability of these strategies for specific use cases such as Gaussian Boson Sampling and its applications and measurement-based approaches to fault-tolerant quantum computing and 5) use squeezed light sources and photon-number resolving detection to engineer non-Gaussian states such as Cat states and GKP states, relevant to Bosonic error-correction codes.

It is essential to the project that you have the following:

  • A PhD (or near completion) in quantum optics
  • Proven research experience in experimental quantum optics
  • Have demonstrated ability in working with non-linear sources of squeezed light and photon detection

Please note this is a re-advertisement, previous applicants need not apply.

Queries relating to the position should be directed to Raj Patel, raj.patel1@imperial.ac.uk

Should you have queries regarding the application process please contact Judith Baylis, j.baylis@imperial.ac.uk

Closing date: 17th March 2024

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