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Rydberg quantum computation with nuclear spins in two-electron neutral atoms

Frontiers of physics 2021年第5期16卷 21-38页

作者： Xiao-Feng Shi School of Physics and Optoelectronic Engineering Xidian UniversityXi’an710071China

Alkaline-earth-like(AEL)atoms with two valence electrons and a nonzero nuclear spin can be excited to Rydberg state for quantum *** AEL ground states possess no hyperfine splitting,but unfortunately a GHz-scale splitting seems necessary for Rydberg *** strong magnetic fields can induce a GHz-scale splitting,weak fields are desirable to avoid noise in ***,we provide two solutions to this outstanding challenge with realistic data of well-studied AEL *** the first theory,the two nuclear spin qubit states∣0〉and∣1〉are excited to Rydberg states∣r〉with detuningΔand 0,respectively,where a MHz-scale detuningΔarises from a weak magnetic field on the order of 1 *** a proper ratio betweenΔandΩ,the qubit state∣1〉can be fully excited to the Rydberg state while∣0〉remains *** the second theory,we show that by choosing appropriate intermediate states a two-photon Rydberg excitation can proceed with only one nuclear spin qubit *** second theory is applicable whatever the magnitude of the magnetic field *** theories bring a versatile means for quantum computation by combining the broad applicability of Rydberg blockade and the incomparable advantages of nuclear-spin quantum memory in two-electron neutral atoms.

关键词： alkaline-earth atom Rydberg state quantum computation neutral atom

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Implementation of Controlled Geometric Phase Gate for Two Trapped neutral atoms

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Communications in Theoretical Physics 2010年第11期 835-839页

作者：吴怀志杨贞标郑仕标 Department of Physics and State Key Laboratory Breeding Base of Photocatalysis Fuzhou University

We propose a scheme for realizing a controlled geometric phase gate for two neutral *** apply thestimulated Raman adiabatic passage to transfer atoms from their ground states into Rydberg excited states, and use theRy... 详细信息

关键词： neutral atom geometric phase gate Rydberg interaction

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Quantum state swap for two trapped Rydberg atoms

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Chinese Physics B 2012年第4期21卷 82-87页

作者：吴怀志杨贞标郑仕标 Laboratory of Quantum Optics Department of PhysicsFuzhou UniversityFuzhou 350002China Key Laboratory of Quantum Information University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China

The quantum swap gate is one of the most useful gates for quantum computation. Two-qubit entanglement and a controlled-NOT quantum gate in a neutral Rydberg atom system have been achieved in recent experiments. It is therefore very interesting to propose a scheme here for swapping a quantum state between two trapped neutral atoms via the Rydberg blockade mechanism. The atoms interact with a sequence of laser pulses without individual addressing. The errors of the swap gate due to imprecision of pulse length, finite Rydberg interaction, and atomic spontaneous emission are discussed.

关键词： neutral atom swap gate Rydberg blockade

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