PHYSICAL REVIEW X (PRX 16, 031077) IBM Heron Cavity QED Architecture AD OPTIMIZED

Triqee Bosonic Phase-Space Studio

Variational Multi-Gaussian Lindbladian Dynamics & Sub-100ns Transmon Readout Pulse Synthesizer

← Launchpad Morning Matrix → Data Room →

Wigner Quasi-Probability Distribution \(W(x, p)\)

Neg < 0 (Quantum) Pos > 0
Phase Space \((x \in [-4, 4], p \in [-4, 4])\)
Quantum State Presets:

Cavity Quantum Telemetry

Mean Photons \(\langle n \rangle\) 4.00
Wigner Negativity \(\delta_W\) 0.000
Quantum Purity \(\text{Tr}(\rho^2)\) 1.000
Squeezing Level 0.0 dB

Lindbladian Hamiltonian Parameters

Coherent Drive \(\Omega\) (GHz): 1.80
Cavity Dissipation \(\kappa\) (MHz): 0.06
Kerr Non-Linearity \(\chi\) (Non-classicality): 0.04
Phase Squeezing Parameter \(r\): 0.00
⚡

IBM Heron Fast Transmon Dispersive Readout Optimizer

Automatic Differentiation synthesized pulse envelope with active cavity ring-up & ring-down depletion

Standard Square Readout BASELINE
300.0 ns

Slow asymptotic exponential ring-up (\(\sim 5 / \kappa\)) and long ring-down tail inducing measurement crosstalk on adjacent qubits.

Fidelity: 93.2% • SNR: 3.24
PRX AD-Optimized Envelope 3.53x FASTER
85.0 ns

Fast overshoot drive injection (15ns) reaching saturation instantly, followed by a reverse active-depletion pulse at 70ns.

Fidelity: 99.4% • Residual Photons: < 0.05
Heron 156Q Heavy-Hex Impact ibm_kingston
71.6% Less Decay

Eliminates \(T_1\) transmon state relaxation during measurement. Directly improves distance-3 surface code syndrome cycles.

Syndrome Cycle: 450ns → 210ns