Sequential weak measurements on a quantum harmonic oscillator enable simultaneous quadrature estimation, with backaction increasing information for some strengths and post-processing extending dynamic range while improving decoherence robustness.
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A floating tunable coupler allows 24 ns adiabatic CZ gates above 99.9% fidelity with exact ZZ=0 at idle for fixed-frequency transmons.
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.
citing papers explorer
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Sequential Measurements as a Resource for Quantum Metrology
Sequential weak measurements on a quantum harmonic oscillator enable simultaneous quadrature estimation, with backaction increasing information for some strengths and post-processing extending dynamic range while improving decoherence robustness.
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Unlocking a fast adiabatic CZ gate and exact residual $ZZ$ cancellation between fixed-frequency transmons using a floating tunable coupler
A floating tunable coupler allows 24 ns adiabatic CZ gates above 99.9% fidelity with exact ZZ=0 at idle for fixed-frequency transmons.
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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.