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Creators/Authors contains: "Coppersmith, S N"

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  1. ; ; ; ; ; ; ; (, PRX Quantum)
    We simulate the Lipkin-Meshkov-Glick model using the variational-quantum-eigensolver algorithm on a neutral atom quantum computer. We test the ground-state energy of spin systems with up to 15 spins. Two different encoding schemes are used: an individual spin encoding where each spin is represented by one qubit, and an efficient Gray code encoding scheme that only requires a number of qubits that scales with the logarithm of the number of spins. This more efficient encoding, together with zero-noise extrapolation techniques, is shown to improve the fidelity of the simulated energies with respect to exact solutions. Published by the American Physical Society2025 
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    Free, publicly-accessible full text available June 1, 2026
  2. ; ; ; ; ; (, Physical Review D)
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  3. ; ; ; ; ; ; ; (, Physical Review C)
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  4. ; ; ; ; (, Physical Review B)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review B)
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  6. ; ; ; ; ; ; ; ; ; (, Nanotechnology)
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  7. ; ; ; ; ; ; ; ; ; ; et al (, npj Quantum Information)
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    Abstract Fast operations, an easily tunable Hamiltonian, and a straightforward two-qubit interaction make charge qubits a useful tool for benchmarking device performance and exploring two-qubit dynamics. Here, we tune a linear chain of four Si/SiGe quantum dots to host two double dot charge qubits. Using the capacitance between the double dots to mediate a strong two-qubit interaction, we simultaneously drive coherent transitions to generate correlations between the qubits. We then sequentially pulse the qubits to drive one qubit conditionally on the state of the other. We find that a conditional π -rotation can be driven in just 74 ps with a modest fidelity demonstrating the possibility of two-qubit operations with a 13.5 GHz clockspeed. 
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  8. ; ; ; ; (, Physical Review D)
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  9. ; ; ; ; (, Journal of Applied Physics)
  10. ; ; ; ; ; ; ; ; ; ; et al (, Applied Physics Letters)
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