Demonstration of a quantum gate using electromagnetically induced transparency

McDonnell, Katie and Keary, Lindsey and Pritchard, Jonathan (2022) Demonstration of a quantum gate using electromagnetically induced transparency. Physical Review Letters, 129 (20). 200501. ISSN 1079-7114 (

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We demonstrate a native CNOT gate between two individually addressed neutral atoms based on electromagnetically induced transparency. This protocol utilizes the strong long-range interactions of Rydberg states to enable conditional state transfer on the target qubit when operated in the blockade regime. An advantage of this scheme is it enables implementation of multiqubit CNOTk gates using a pulse sequence independent of qubit number, providing a simple gate for efficient implementation of digital quantum algorithms and stabilizer measurements for quantum error correction. We achieve a loss corrected gate fidelity of FCNOTcor=0.82(6), and prepare an entangled Bell state with FBellcor=0.66(5), limited at present by laser power. We present a number of technical improvements to advance this to a level required for fault-tolerant scaling.