Minor formatting fixes

README.md

@@ -586,7 +586,7 @@ The `models/` directory contains:
 
 ### Measurement Duration Analysis
 
-**measurement_duration/** — Directly addresses the question raised by Philippe Lewalle (author of "Optimal Zeno Dragging for Quantum Control," PRX Quantum 5, 020366): "Does the relatively long duration of measurement compared to unitary operations not present an obstacle for practical adoption?" On ibm_torino, measurements take 1.56 μs versus 32 ns for single-qubit gates — a 49× overhead per measurement step. A Zeno circuit with N=8 measurements accumulates 12.5 μs of measurement time, roughly 10.8% of the qubit's T1 (115.2 μs at time of experiment).
+**measurement_duration/** — Motivated by a question from Dr. Philippe Lewalle (MIT Lincoln Laboratory) on whether measurement duration overhead negates Zeno's fidelity advantage in practice. On ibm_torino, measurements take 1.56 μs versus 32 ns for single-qubit gates — a 49× overhead per measurement step. A Zeno circuit with N=8 measurements accumulates 12.5 μs of measurement time, roughly 10.8% of the qubit's T1 (115.2 μs at time of experiment).
 
 To isolate the decoherence cost of this duration overhead, we introduce a **delay-matched control**: a standard Ry(θ)·Ry(-θ) circuit with an inserted idle delay equal to the total measurement time of the corresponding Zeno circuit. This ensures the delay-matched circuit experiences the same wall-clock decoherence as Zeno but without the measurement-based error suppression. All circuits target |0⟩ as the ideal output, following the same protocol as `zeno_gates_corrected`.
 
@@ -604,7 +604,7 @@ The experiment tests 6 rotation angles (I, Ry(π/8), Ry(π/4), Ry(π/2), Ry(3π/
 | 24 | 37.44 | 32.5% | 96.6% | 57.8% | +38.8pp | 40.9 | <10⁻³⁶⁶ |
 | 32 | 49.92 | 43.3% | 95.5% | 45.9% | +49.6pp | 45.6 | <10⁻⁴⁵⁴ |
 
-Zeno fidelity remains flat at 95.5% ± 0.7% across all N values (linear regression slope not significantly different from zero, p = 0.17). The delay-matched circuits decay as expected from T1 decoherence. The fidelity gap between Zeno and delay-matched *widens* with increasing circuit time, reaching 49.6 percentage points at N=32 where 43% of T1 has elapsed. The answer to Lewalle's question: the measurement duration is not an obstacle — the longer the circuit runs, the more Zeno outperforms, because the measurements actively suppress the decoherence that the time overhead causes.
+Zeno fidelity remains flat at 95.5% ± 0.7% across all N values (linear regression slope not significantly different from zero, p = 0.17). The delay-matched circuits decay as expected from T1 decoherence. The fidelity gap between Zeno and delay-matched *widens* with increasing circuit time, reaching 49.6 percentage points at N=32 where 43% of T1 has elapsed. The answer is that measurement duration is not an obstacle — the longer the circuit runs, the more Zeno outperforms, because the measurements actively suppress the decoherence that the time overhead causes.
 
 99 circuits, 4096 shots each, job ID d6jh8akgmsgc73bv2uu0, 113s QPU time. March 3, 2026.
 

measurement_duration_experiment.py

@@ -1,5 +1,5 @@
 """
-Measurement Duration Experiment — Answering Lewalle's Question
+Measurement Duration Experiment
 
 "Does the relatively long duration of measurement compared to unitary
 operations not present an obstacle for practical adoption?"
@@ -12,7 +12,7 @@ Protocol (matching zeno_gates_corrected):
 Fidelity = P(0) for all circuits. This is a fair comparison because all
 circuits target the same output state in the same measurement basis.
 
-The delay-matched circuit answers Lewalle directly: it experiences the same
+The delay-matched circuit isolates the decoherence cost: it experiences the same
 wall-clock decoherence as Zeno but without the measurement-based error
 suppression. If Zeno > delay-matched, measurements actively help.
 """
@@ -200,7 +200,7 @@ def analyze_zeno(bitstrings, n_meas):
 def main():
     print("=" * 70)
     print("MEASUREMENT DURATION EXPERIMENT")
-    print("Answering Lewalle: Does measurement duration obstruct adoption?")
+    print("Does measurement duration obstruct practical adoption?")
     print("=" * 70)
 
     service = QiskitRuntimeService(channel="ibm_cloud", instance="claude")
@@ -394,7 +394,7 @@ def main():
     output = {
         'experiment': 'measurement_duration_analysis',
         'description': "Tests whether measurement duration overhead negates Zeno fidelity advantage",
-        'question': "Lewalle: Does the relatively long duration of measurement compared to "
+        'question': "Does the relatively long duration of measurement compared to "
                     "unitary operations not present an obstacle for practical adoption?",
         'timestamp': start_time.isoformat(),
         'backend': backend.name,

results/measurement_duration/extract.py

@@ -65,7 +65,7 @@ with open(base / 'zeno_vs_standard_N8.csv', 'w') as f:
                     f"{za['fidelity_weighted']:.6f},{za['success_rate']:.6f},"
                     f"{df:.6f},{za['fidelity_hard_ps']-sf:.6f}\n")
 
-# CSV: Zeno vs delay-matched (the Lewalle answer)
+# CSV: Zeno vs delay-matched (duration overhead comparison)
 with open(base / 'zeno_vs_delay_matched.csv', 'w') as f:
     f.write('gate,n_meas,total_time_us,t1_fraction,zeno_hard_ps,zeno_weighted,zeno_success_rate,delay_fidelity,zeno_minus_delay,z_score,p_value\n')
     for gate in ['I', 'Ry_pi8', 'Ry_pi4', 'Ry_pi2', 'Ry_3pi4', 'X']:

results/measurement_duration/measurement_duration_analysis.json

@@ -1,7 +1,7 @@
 {
   "experiment": "measurement_duration_analysis",
   "description": "Tests whether measurement duration overhead negates Zeno fidelity advantage",
-  "question": "Lewalle: Does the relatively long duration of measurement compared to unitary operations not present an obstacle for practical adoption?",
+  "question": "Does the relatively long duration of measurement compared to unitary operations not present an obstacle for practical adoption?",
   "timestamp": "2026-03-03T17:02:30.385768+00:00",
   "backend": "ibm_torino",
   "shots": 4096,

results/measurement_duration/summary.json

@@ -1,7 +1,7 @@
 {
   "experiment": "measurement_duration_analysis",
   "description": "Tests whether measurement duration overhead negates Zeno fidelity advantage",
-  "question": "Lewalle: Does the relatively long duration of measurement compared to unitary operations not present an obstacle for practical adoption?",
+  "question": "Does the relatively long duration of measurement compared to unitary operations not present an obstacle for practical adoption?",
   "backend": "ibm_torino",
   "timestamp": "2026-03-03T17:02:30.385768+00:00",
   "job_id": "d6jh8akgmsgc73bv2uu0",