Symmetry-based qubits allow Grover four-ports to serve as deterministic linear-optical CNOT gates with no post-selection or ancillae required.
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Gradient-descent optimization of eight circuit parameters in a Strawberry Fields model yields CFI gains of 153% to 1775% and 8x to 133x more useful events per pulse versus Afek et al. (2010) for N=2-5, reaching 82% of Heisenberg limit at N=2 and 58% at N=5.
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Deterministic linear-optical computing with symmetry-based qubits
Symmetry-based qubits allow Grover four-ports to serve as deterministic linear-optical CNOT gates with no post-selection or ancillae required.
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Quantum-Enhanced Single-Parameter Phase Estimation with Adaptive NOON States
Gradient-descent optimization of eight circuit parameters in a Strawberry Fields model yields CFI gains of 153% to 1775% and 8x to 133x more useful events per pulse versus Afek et al. (2010) for N=2-5, reaching 82% of Heisenberg limit at N=2 and 58% at N=5.