Native spin-changing collisions plus arbitrary quadratic Zeeman shift produce universal OAT-scalable spin squeezing in spin-1 BECs, freezable by turning the shift off.
Big cats: Entanglement in 120 qubits and beyond
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Any three PT moments of orders k<l<m certify NPT entanglement if p_l > p_k^x p_m^{1-x}, and Stieltjes-m equals PPT when ρ^Γ has at most (m+1)/2 distinct eigenvalues.
Empirically learned dynamical decoupling sequences reduce average error rates in dynamic quantum circuits by a factor of three and enable nontrivial process fidelity for quantum Fourier transforms on up to 20 qubits.
A fan-out coupling architecture enables constant-depth direct quantum state tomography with built-in error mitigation via involutory repetition, experimentally validated up to 20 qubits on superconducting hardware.
Network-mediated capacitive couplings in transmon arrays accelerate OTOC saturation and produce intermediate spectral statistics between Poisson and GOE limits.
Hardware benchmarks of repetition and triangular color codes for quantum error detection show promise for scaling despite exponential sample costs and embedding overheads.
Compressed sensing exploits sparsity in GHZ states to reduce measurement overhead for fidelity estimation while maintaining accuracy, as shown in simulations and Quantinuum trapped-ion experiments with error detection.
citing papers explorer
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Universal spin-squeezing dynamics in spinor condensates
Native spin-changing collisions plus arbitrary quadratic Zeeman shift produce universal OAT-scalable spin squeezing in spin-1 BECs, freezable by turning the shift off.
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Detecting entanglement from few partial transpose moments and their decay via weight enumerators
Any three PT moments of orders k<l<m certify NPT entanglement if p_l > p_k^x p_m^{1-x}, and Stieltjes-m equals PPT when ρ^Γ has at most (m+1)/2 distinct eigenvalues.
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Learning error suppression strategies for dynamic quantum circuits
Empirically learned dynamical decoupling sequences reduce average error rates in dynamic quantum circuits by a factor of three and enable nontrivial process fidelity for quantum Fourier transforms on up to 20 qubits.
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Efficient direct quantum state tomography using fan-out couplings
A fan-out coupling architecture enables constant-depth direct quantum state tomography with built-in error mitigation via involutory repetition, experimentally validated up to 20 qubits on superconducting hardware.
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Network-Mediated Capacitive Coupling Drives Fast OTOC Saturation in Superconducting Circuits
Network-mediated capacitive couplings in transmon arrays accelerate OTOC saturation and produce intermediate spectral statistics between Poisson and GOE limits.
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Opportunities and challenges in scaling quantum error detection on hardware
Hardware benchmarks of repetition and triangular color codes for quantum error detection show promise for scaling despite exponential sample costs and embedding overheads.
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Compressed Sensing for Efficient Fidelity Estimation of GHZ States
Compressed sensing exploits sparsity in GHZ states to reduce measurement overhead for fidelity estimation while maintaining accuracy, as shown in simulations and Quantinuum trapped-ion experiments with error detection.
- MCMit: Hardware-Software Co-Design for Mid-Circuit Measurement Error Mitigation