Unveiling the limits in the coherence of spin qubits against magnetic noise

Abstract

The realization of spin-based logical gates crucially depends on magnetically-coupled spin qubits. Thus, understanding decoherence when spin qubits are in close proximity will become a roadblock to overcome. Herein, we provide a general first-principles model that straightforwardly evaluates the spin bath effect on the qubit phase memory time $T_m$ . The method is applied to a ground-spin $J=8$ magnetic molecule 1 displaying atomic clock transitions, which remarkably increase $T_m$ at unusually high spin concentrations. Besides reproducing experimental $T_m$ values calculated by recent models in simple spin-1/2 systems, our approach unveils the causes that limit the coherence reached at the clock transitions in more challenging systems such as 1, where these previous models fail.

References in corpus (9)

• Operating Quantum States in Single Magnetic Molecules: Implementation of Grover's Quantum Algorithm
• Atomic clock transitions in silicon-based spin qubits
• Decoherence in Crystals of Quantum Molecular Magnets
• Method of extending hyperfine coherence times in Pr^3+:Y_2SiO_5
• Molecular prototypes for spin-based CNOT quantum gates
• Role of vibrations on decoherence in molecular spin qubits: The case of [Cu(mnt)${}_2$]${}^{2-}$
• A scalable architecture for quantum computation with molecular nanomagnets
• Coherence Window in the dynamics of Quantum Nanomagnets
• Electronic spin-spin decoherence contribution in molecular qubits by quantum unitary spin dynamics

Cited by in corpus (2)

• Electrical two-qubit gates within a pair of clock-qubit magnetic molecules
• Decoherence of a singlet-triplet superposition state under dipolar interactions of an uncorrelated environment