A method is given to compute the minimum energy of certain spin Hamiltonians over separable states, expressed via quantum Fisher information for Ising models and fidelity for Heisenberg chains.
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For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.
Direct use of mechanical qubits from levitated particles for gravimetry achieves m^{-1/2} sensitivity scaling and 0.1 μGal/√Hz performance, outperforming traditional schemes by two orders of magnitude while reaching double standard quantum limits.
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General method for obtaining the energy minimum of spin Hamiltonians for separable states
A method is given to compute the minimum energy of certain spin Hamiltonians over separable states, expressed via quantum Fisher information for Ising models and fidelity for Heisenberg chains.
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Entanglement Enhanced Sensing with Qubits affected by non-Markovian Dephasing
For suitable spatial and temporal correlations in non-Markovian dephasing, entangled probes achieve superior sensitivity scaling with probe number compared to separable states in Ramsey spectroscopy.
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Quantum gravimetry with mechanical qubits
Direct use of mechanical qubits from levitated particles for gravimetry achieves m^{-1/2} sensitivity scaling and 0.1 μGal/√Hz performance, outperforming traditional schemes by two orders of magnitude while reaching double standard quantum limits.