4.5 Article

Accurate Quantum Logic Gates by Spin Echo in Rydberg Atoms

Journal

PHYSICAL REVIEW APPLIED
Volume 10, Issue 3, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.10.034006

Keywords

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Funding

  1. Fundamental Research Funds for the Central Universities
  2. 111 Project [B17035]

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Scalable quantum computing is based on realizable accurate quantum gates. For neutral atoms, it is an outstanding challenge to design a high-fidelity two-qubit entangling gate without resorting to difficult techniques such as shaping laser pulses or cooling atoms to motional ground states. By using spin echo to suppress the blockade error, we propose an easily realizable controlled-phase Rydberg quantum gate of high intrinsic fidelity. In the context of spin echo, we show that the fundamental blockade error of the traditional Rydberg gate, of the order of is an element of similar to 10(-3), actually results from two clockwise rotations of Rabi frequencies (Omega) over bar (+/-) = V +/- root V-2+Omega(2). In our echo sequence, such an error can be suppressed to the order of is an element of(2) by adding two anticlockwise rotations with frequencies -(Omega) over bar (+/-). With the blockade error effectively removed, the error caused by Rydberg-state decay becomes the final fundamental limit to the gate accuracy, which, in principle, can be reduced beyond the level of 10(-5). Furthermore, due to the small population involved in the echo process, the spin-echo gate is robust against the variation of Rydberg blockade caused by the drift of the qubits, so that it can still be much more accurate than that of a traditional Rydberg gate even for qubits cooled only to the submillikelvin regime.

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