Journal
NATURE PHOTONICS
Volume 7, Issue 2, Pages 138-141Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.283
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Funding
- National Science Foundation (NSF) [PHY-0969996]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969996] Funding Source: National Science Foundation
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The ability of a few-photon light field to impart an appreciable phase shift on another light field is critical for many quantum information applications(1,2). A recently proposed paradigm(3) for quantum computation utilizes weak nonlinearities, where a strong field mediates such cross-phase shifts between single photons. Such a protocol promises to be feasible in terms of scalability to many qubits if a cross-phase shift of 10(-5) to 10(-2) radians per photon can be achieved. A promising platform to achieve such cross-phase shifts is the hollow-core photonic bandgap fibre(4), which can highly confine atomic vapours and light over distances much greater than the diffraction length(5,6). Here, we produce large cross-phase shifts of 0.3 mrad per photon with a fast response time (<5 ns) using rubidium atoms confined to a hollow-core photonic bandgap fibre, which represents, to our knowledge, the largest such nonlinear phase shift induced in a single pass through a room-temperature medium.
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