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• W4280641983 abstract "Optical qubits uniquely combine information transfer in optical fibers with a good processing capability and are therefore attractive tools for quantum technologies. A large challenge, however, is to overcome the low efficiency of two-qubit logic gates. The experimentally achieved efficiency in an optical controlled not (cnot) gate reached approximately 11% in 2003 and has seen no increase since. Here, we report on a new platform that was designed to surpass this long-standing record. The new scheme avoids inherently probabilistic protocols and, instead, combines aspects of two established quantum nonlinear systems: atom-cavity systems and Rydberg electromagnetically induced transparency. We demonstrate a cnot gate between two optical photons with an average efficiency of 41.7(5)% at a postselected process fidelity of 81(2)%. Moreover, we extend the scheme to a cnot gate with multiple target qubits and produce entangled states of presently up to five photons. All these achievements are promising and have the potential to advance optical quantum information processing in which almost all advanced protocols would profit from high-efficiency logic gates.1 MoreReceived 8 December 2021Accepted 20 April 2022DOI:https://doi.org/10.1103/PhysRevX.12.021035Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasElectromagnetically induced transparencyQuantum gatesQuantum information with atoms & lightPhysical SystemsRydberg atoms & moleculesAtomic, Molecular & OpticalQuantum Information" @default.
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• W4280641983 date "2022-05-11" @default.
• W4280641983 modified "2023-10-03" @default.
• W4280641983 title "Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%" @default.
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• W4280641983 doi "https://doi.org/10.1103/physrevx.12.021035" @default.
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