PhD Studentship: Cold Atoms as an Optical Quantum Memory

An optical quantum memory, a device which can store and retrieve an arbitrary quantum state at the single photon level, has been identified as a significant cornerstone of photonic quantum technologies. The development of such a memory would allow the creation and development of a large number of quantum technologies. These would range from the ability to synchronise processing steps in an optical quantum computer, to the construction of a quantum repeater which would allow faithful transmission of quantum states over arbitrarily long distances - allowing the creation of a quantum internet.

This project will work on developing optical quantum memories where the input quantum state (e.g. a single photon) is stored as an excitation within an atomic ensemble. To perform storage, we mediate the absorption of the quantum state by simultaneously addressing the ensemble with an additional (control) laser pulse. To retrieve our quantum state from the atoms, the control field is reapplied at a later time, recreating the input photon on demand. By manipulating the amplitude and phase of the control field relative to the signal, we are able to optimise the atomic interaction leading to longer storage lifetimes and higher storage efficiencies.

This research spans quantum optics, atomic physics and quantum technologies with the aim to build a high efficiency cold atom quantum memory system. Cold Atom systems are some of the most promising mediums in which to store quantum states, with the reduced motion of the atoms offering the potential for long storage times. There is substantial effort, both academic and commercial to simplify and miniaturise cold atom sources for quantum technology. This project will build on world class developments in this area and optimise developing all aspects of a cold atom quantum memory,

This project would suit an experimental student with a strong background in Physics or Engineering and an interest in quantum technologies.

The successful candidate will join the new Quantum Memories group at Birmingham, which has been founded to develop novel protocols and systems for quantum memories and translate their use into practical applications. The group is situated within the Quantum Matter theme of the School of Physics and Astronomy, and links to established activities in Quantum Technologies, including in atom interferometry and optical clocks, and Cold Atoms. The School is also host to the National Quantum Technology Hub for Quantum Sensing, Imaging and Timing.

The School of Physics and Astronomy is an Institute of Physics Juno Champion since 2014 and holder of the Athena SWAN Silver Award. Both initiatives recognise the School’s commitment to promote diversity and equality, and to encourage better practice for all members of the community, whilst also working towards developing an equitable working culture in which all students and staff can achieve their full potential. We welcome applications from all qualified applicants and encourage applications from traditionally under-represented groups in Physics and Astronomy including, but not limited to, women and Black, Asian and Minority Ethnicity.

For more information please contact Dr Thomas Hird t.m.hird@bham.ac.uk and see https://www.birmingham.ac.uk/staff/profiles/physics/hird-thomas

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