Blueprint of a Molecular Spin Quantum Processor

Abstract

The implementation of a universal quantum processor still poses fundamental issues related to error mitigation and correction, which demand to investigate also platforms and computing schemes alternative to the main stream. A possibility is offered by employing multi-level logical units (qudits), naturally provided by molecular spins. Here we present the blueprint of a Molecular Spin Quantum Processor consisting of single Molecular Nanomagnets, acting as qudits, placed within superconducting resonators adapted to the size and interactions of these molecules to achieve a strong single spin to photon coupling. We show how to implement a universal set of gates in such a platform and to readout the final qudit state. Single-qudit unitaries (potentially embedding multiple qubits) are implemented by fast classical drives, while a novel scheme is introduced to obtain two-qubit gates via resonant photon exchange. The latter is compared to the dispersive approach, finding in general a significant improvement. The performance of the platform is assessed by realistic numerical simulations of gate sequences, such as Deutsch-Josza and quantum simulation algorithms. The very good results demonstrate the feasibility of the molecular route towards a universal quantum processor.

16 pages, 11 figures. Accepted in Physical Review Applied

References in corpus (37)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Integrated Photonic Quantum Technologies
• Coupling Superconducting Qubits via a Cavity Bus
• Hartree-Fock on a superconducting qubit quantum computer
• Supramolecular Spin Valves
• Quantum magnonics: when magnon spintronics meets quantum information science
• Planar Superconducting Resonators with Internal Quality Factors above One Million
• New class of quantum error-correcting codes for a bosonic mode
• A compact ion-trap quantum computing demonstrator
• Operating Quantum States in Single Magnetic Molecules: Implementation of Grover's Quantum Algorithm
• Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
• Low-Disorder Microwave Cavity Lattices for Quantum Simulation with Photons
• Qubit-oscillator dynamics in the dispersive regime: analytical theory beyond rotating-wave approximation
• Tunable resonators for quantum circuits
• Quantum computers as universal quantum simulators: state-of-art and perspectives
• Coherent manipulation of a molecular Ln-based nuclear qudit coupled to an electron qubit
• Digital Quantum Simulation of Spin Systems in Superconducting Circuits
• Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling
• A scalable architecture for quantum computation with molecular nanomagnets
• Electric field control of spins in molecular magnets
• Coupling single molecule magnets to quantum circuits
• A perspective on scaling up quantum computation with molecular spins
• Criteria for Exact Qudit Universality
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions
• Coherent spin control by electrical manipulation of the magnetic anisotropy
• Enhanced molecular spin-photon coupling at superconducting nanoconstrictions
• Electron Spin Resonance spectroscopy with femtoliter detection volume
• Molecular spin qudits for quantum simulation of light-matter interactions
• Counteracting dephasing in Molecular Nanomagnets by optimized qudit encodings
• Magnetic Exchange Interactions in the Molecular Nanomagnet Mn${}_{12}$
• Quantum-Information Processing with Hybrid Spin-Photon Qubit Encoding
• Digital quantum simulators in a scalable architecture of hybrid spin-photon qubits
• Optimal synthesis of multivalued quantum circuit
• Dispersive readout of molecular spin qudits
• Multi-qudit interactions in molecular spins

Cited by in corpus (15)

• Proof-of-concept Quantum Simulator based on Molecular Spin Qudits
• Systematic study of High $E_J/E_C$ transmon qudits up to $d=12$
• Qudits for decomposing multiqubit gates and realizing quantum algorithms
• Noisy Qudit vs Multiple Qubits : Conditions on Gate Efficiency for Enhancing Fidelity
• Low loss hybrid Nb/Au superconducting resonators for quantum circuit applications
• Fault-Tolerant Computing with Single Qudit Encoding
• Qudit Machine Learning
• Small but large: Single organic molecules as hybrid platforms for quantum technologies
• Semi-Empirical Haken-Strobl Model for Molecular Spin Qubits
• A Design Framework for the Simulation of Distributed Quantum Computing
• Dephasing-tolerant quantum sensing for transverse magnetic fields with spin qudits
• Quantum Information Processing with Molecular Nanomagnets: an introduction
• Optimal Control of Spin Qudits Subject to Decoherence Using Amplitude-and-Frequency-Constrained Pulses
• Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces
• Enhancing Coherence with a Clock Transition and Dynamical Decoupling in the Cr${}_7$Mn Molecular Nanomagnet