Квантовий комп'ютер на нейтральних атомах

A neutral atom quantum computer utilizes arrays of neutral atoms, trapped and manipulated by precisely controlled laser beams (optical tweezers), as qubits. Each atom's internal electronic state serves as the qubit's quantum state (e.g., |0⟩ or |1⟩). To perform quantum operations, atoms are first cooled to near absolute zero and then trapped in a 3D optical lattice. Qubit manipulation, such as single-qubit rotations, is achieved using resonant laser pulses. Two-qubit gates, crucial for entanglement, are typically implemented via Rydberg blockade. In this mechanism, two atoms are excited to highly energetic Rydberg states using lasers. If one atom is already in a Rydberg state, the strong dipole-dipole interaction between Rydberg atoms shifts the energy levels of the neighboring atom, preventing it from being excited. This blockade effect allows for conditional logic operations. Neutral atom platforms offer advantages like long coherence times, high qubit connectivity (atoms can be moved or interact with many others), and scalability potential by increasing the number of trapped atoms. However, challenges include the complexity of laser control systems, atom loss due to collisions or imperfect trapping, and the fidelity of two-qubit gates.