CANP enhances quantum Fisher information by using noncommutativity between critical state preparation and parameter encoding, demonstrated in the quantum Rabi and Lipkin-Meshkov-Glick models at fixed resources.
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An adiabatic protocol for quantum phase estimation that reaches optimal scaling T = O(1/ε log(1/δ)) by encoding eigenvalues in computational basis populations rather than phases.
Integrating repetition code QEC with logical GHZ entanglement in CMOS spin qubits reduces effective dephasing and enables up to order-of-magnitude improvements in sensitivity to axion-electron coupling g_ae by restoring entanglement-enhanced sensing.
A protocol with two generalized measurements prepares versatile probe states from thermal qubits to enhance quantum Fisher information for decay rate and temperature estimation in amplitude damping channels, deriving an analytical link to thermodynamic susceptibilities and Hamiltonian variance valid
Non-Markovian delays in two waveguide-coupled emitters create atom-photon quasi-bound states and multimode interactions that boost quantum Fisher information for sensing field gradients.
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.
A hybrid magnonic optomechanical cavity with an internal OPA achieves full suppression of radiation-pressure back-action via coherent quantum noise cancellation and operates beyond the standard quantum limit at reduced pump power.
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.
Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.
A new ancilla-free amplitude estimation method uses statistical eigengap estimation to achieve near-optimal query-depth tradeoffs in low-depth regimes with provable guarantees.
A squeezed-vacuum interferometer with nonlinear phase estimation achieves Heisenberg scaling in the lossless limit, sub-SQL sensitivity under noise, and the first experimental quantum-optimal Bayesian signal estimation in a balanced interferometer.
In the random-field XXZ model, Wehrl-Rényi entropy growth for z-polarized product states shows non-monotonic dependence on initial entanglement, with the first regime set by local integrals of motion and the second by inter-site correlations.
Higher thermodynamic efficiency in preparing non-equilibrium spin states in atomic vapors directly improves the quantum Fisher information bound on magnetometer sensitivity.
High-order squeezed states can deliver better metrological precision than squeezed vacuum at equal occupations, with the advantage depending on the state family and sensitive to dephasing noise.
citing papers explorer
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Enhanced quantum metrology by criticality-assisted noncommutative preparation
CANP enhances quantum Fisher information by using noncommutativity between critical state preparation and parameter encoding, demonstrated in the quantum Rabi and Lipkin-Meshkov-Glick models at fixed resources.
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Adiabatic Quantum Phase Estimation
An adiabatic protocol for quantum phase estimation that reaches optimal scaling T = O(1/ε log(1/δ)) by encoding eigenvalues in computational basis populations rather than phases.
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Quantum Error Correction Assisted Axion Search in CMOS Spin Qubit Arrays
Integrating repetition code QEC with logical GHZ entanglement in CMOS spin qubits reduces effective dephasing and enables up to order-of-magnitude improvements in sensitivity to axion-electron coupling g_ae by restoring entanglement-enhanced sensing.
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Versatile probe state preparation via generalized measurements for quantum sensing and thermometry
A protocol with two generalized measurements prepares versatile probe states from thermal qubits to enhance quantum Fisher information for decay rate and temperature estimation in amplitude damping channels, deriving an analytical link to thermodynamic susceptibilities and Hamiltonian variance valid
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Non-Markovian delay-assisted sensing with waveguide-coupled quantum emitters
Non-Markovian delays in two waveguide-coupled emitters create atom-photon quasi-bound states and multimode interactions that boost quantum Fisher information for sensing field gradients.
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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 Noise Suppression Beyond the Standard Quantum Limit in a Hybrid Magnonic Optomechanical System
A hybrid magnonic optomechanical cavity with an internal OPA achieves full suppression of radiation-pressure back-action via coherent quantum noise cancellation and operates beyond the standard quantum limit at reduced pump power.
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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.
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Leggett-Garg Inequality Violations Bound Quantum Fisher Information
Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.
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Low-depth amplitude estimation via statistical eigengap estimation
A new ancilla-free amplitude estimation method uses statistical eigengap estimation to achieve near-optimal query-depth tradeoffs in low-depth regimes with provable guarantees.
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Noise-Resilient Quantum Metrology
A squeezed-vacuum interferometer with nonlinear phase estimation achieves Heisenberg scaling in the lossless limit, sub-SQL sensitivity under noise, and the first experimental quantum-optimal Bayesian signal estimation in a balanced interferometer.
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Entanglement Growth from Structured Initial States in Many-Body Localized Systems
In the random-field XXZ model, Wehrl-Rényi entropy growth for z-polarized product states shows non-monotonic dependence on initial entanglement, with the first regime set by local integrals of motion and the second by inter-site correlations.
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Thermodynamical aspects of optically pumped dense atomic medium
Higher thermodynamic efficiency in preparing non-equilibrium spin states in atomic vapors directly improves the quantum Fisher information bound on magnetometer sensitivity.
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Quantum metrological advantage of high-order squeezed states
High-order squeezed states can deliver better metrological precision than squeezed vacuum at equal occupations, with the advantage depending on the state family and sensitive to dephasing noise.