Room-temperature photonic logical qubits via second-order nonlinearities

Recent progress in nonlinear optical materials and microresonators has brought quantum computing with bulk optical nonlinearities into the realm of possibility. This platform is of great interest, not only because photonics is an obvious choice for quantum networks, but also as a promising route to...

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Bibliographic Details
Published in:Nature communications Vol. 12; no. 1; pp. 191 - 10
Main Authors: Krastanov, Stefan, Heuck, Mikkel, Shapiro, Jeffrey H., Narang, Prineha, Englund, Dirk R., Jacobs, Kurt
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 08.01.2021
Nature Publishing Group
Nature Portfolio
Subjects:
639/624/400/385
639/624/400/482
639/766/483/2802
639/766/483/481
Circuits
Data processing
Error correction
Feedforward control
Gates (circuits)
Humanities and Social Sciences
Information processing
Logic circuits
multidisciplinary
Nonlinear systems
Nonlinearity
Optical materials
Optics
Photonics
Quantum computing
Quantum phenomena
Qubits (quantum computing)
Room temperature
Science
Science (multidisciplinary)
ISSN:2041-1723, 2041-1723
Online Access:Get full text
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Summary:Recent progress in nonlinear optical materials and microresonators has brought quantum computing with bulk optical nonlinearities into the realm of possibility. This platform is of great interest, not only because photonics is an obvious choice for quantum networks, but also as a promising route to quantum information processing at room temperature. We propose an approach for reprogrammable room-temperature photonic quantum logic that significantly simplifies the realization of various quantum circuits, and in particular, of error correction. The key element is the programmable photonic multi-mode resonator that implements reprogrammable bosonic quantum logic gates, while using only the bulk χ (2) nonlinear susceptibility. We theoretically demonstrate that just two of these elements suffice for a complete, compact error-correction circuit on a bosonic code, without the need for measurement or feed-forward control. Encoding and logical operations on the code are also easily achieved with these reprogrammable quantum photonic processors. An extrapolation of current progress in nonlinear optical materials and photonic circuits indicates that such circuitry should be achievable within the next decade. Photonic quantum computation via bulk optical nonlinearities presents challenges, due to the weakness of nonlinearity and the difficulties in doing without feed-forward control. Here, the authors propose an all-unitary approach that is based on a triply-resonant cavity with a time-dependent drive.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-20417-4