Universal relations connect asymptotic equal-time spin correlations, dynamical structure factor, and contact density in long-range quantum spin chains via effective field theory and operator product expansion, with numerical verification.
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Long-range interactions in quantum spin chains enable the Efimov effect for magnons by inducing continuous scale invariance in two-body states that becomes discrete in the three-body problem.
A protocol extracts scaling dimensions of d=3 CFTs from the spectrum of qubit Hamiltonians on polyhedral lattices, achieving few-percent accuracy on the 3D Ising model with 20 qubits.
Thermal operations can generate nonstabiliser states from stabilizer states, with an analytic characterization for qubits and a general trade-off between attainable nonstabiliserness and initial free energy.
Simulations demonstrate that Krotov optimal control can achieve gate fidelities ≳0.9 in noisy static exchange-coupled surface qubits by adapting to specific noise sources, outperforming standard Rabi driving.
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Universal Relations in Long-range Quantum Spin Chains
Universal relations connect asymptotic equal-time spin correlations, dynamical structure factor, and contact density in long-range quantum spin chains via effective field theory and operator product expansion, with numerical verification.
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Efimov Effect in Long-range Quantum Spin Chains
Long-range interactions in quantum spin chains enable the Efimov effect for magnons by inducing continuous scale invariance in two-body states that becomes discrete in the three-body problem.
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Qubit discretizations of d=3 conformal field theories
A protocol extracts scaling dimensions of d=3 CFTs from the spectrum of qubit Hamiltonians on polyhedral lattices, achieving few-percent accuracy on the 3D Ising model with 20 qubits.
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Trading athermality for nonstabiliserness
Thermal operations can generate nonstabiliser states from stabilizer states, with an analytic characterization for qubits and a general trade-off between attainable nonstabiliserness and initial free energy.
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Overcoming limitations on gate fidelity in noisy static exchange-coupled surface qubits
Simulations demonstrate that Krotov optimal control can achieve gate fidelities ≳0.9 in noisy static exchange-coupled surface qubits by adapting to specific noise sources, outperforming standard Rabi driving.