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A two-qubit molecular architecture for electron-mediated nuclear quantum simulation.

Matteo Atzori1, Alessandro Chiesa2,3, Elena Morra4

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Researchers developed a molecular system for quantum computing using nuclear spins as qubits. This system enables switchable interactions and controlled entanglement, paving the way for molecular quantum logic operations and simulations.

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Area of Science:

  • Quantum Information Science
  • Molecular Quantum Computing
  • Spin Physics

Background:

  • Quantum information processing relies on highly coherent qubits and switchable interactions.
  • Nuclear spins offer a promising route for robust qubits in quantum logic operations.
  • Molecular architectures provide a platform for implementing quantum gates.

Purpose of the Study:

  • To propose and demonstrate a molecular architecture for quantum logic operations.
  • To enable switchable interactions between nuclear spin qubits using electronic spin excitations.
  • To achieve controlled entanglement generation for quantum simulations.

Main Methods:

  • Utilizing vanadyl moieties for a two-qubit molecular architecture.
  • Employing fast electronic spin excitations to control nuclear spin interactions.
  • Characterizing the system with continuous-wave and pulsed electron paramagnetic resonance (EPR) spectroscopy.
  • Simulating system dynamics using experimentally derived spin Hamiltonian parameters.

Main Results:

  • Demonstrated controlled entanglement between nuclear spin qubits via chemically tuned magnetic coupling.
  • Observed splitting of vanadium(iv) hyperfine lines in EPR spectra, confirming magnetic coupling.
  • Achieved remarkably long coherence times for the nuclear spin qubits.
  • Successfully simulated the implementation of a control-Z (CZ) gate and quantum simulations.

Conclusions:

  • The proposed molecular complex can implement a control-Z (CZ) gate and perform simple quantum simulations.
  • This work highlights the potential of molecular systems for scalable quantum information processing.
  • A proof-of-principle experiment for simulating quantum tunneling of magnetization in a spin system is proposed.