Lab Safety and Control-Change Checklists

This appendix provides operational checklists for quantum labs and embedded-control changes. It is not a substitute for local safety requirements, qualified environmental health and safety review, or applicable law.

P.1 Safety state before runtime admission

flowchart LR
    Facility[Facility state] --> Sensors[Sensors healthy]
    Sensors --> Access[Access controlled]
    Access --> Permit[No conflicting permit]
    Permit --> Interlocks[Interlocks active]
    Interlocks --> Admit[Admit runtime jobs]

• Oxygen monitoring healthy where cryogens are used
• Laser controlled areas in expected state
• Access restrictions active
• Emergency stop path known and tested
• No maintenance permit conflicts with execution
• Facility alarm integration healthy
• Runtime has current facility-safe state

P.2 Cryogen operation checklist

flowchart TB
    Cryogen[Cryogen task] --> Training[Training current]
    Cryogen --> PPE[PPE available]
    Cryogen --> Vent[Ventilation verified]
    Cryogen --> Container[Container rated]
    Cryogen --> Monitor[Oxygen monitor verified]
    Cryogen --> Log[Task logged]

• Operator training current
• Buddy or escalation process available
• Room ventilation verified
• Oxygen monitor status verified
• PPE available and appropriate
• Container rated and inspected
• Transfer path clear
• Completion logged
• Anomalies reported

P.3 Laser operation checklist

flowchart TB
    Laser[Laser task] --> Class[Class and wavelength known]
    Class --> Eyewear[Eyewear selected]
    Eyewear --> Beam[Beam path controlled]
    Beam --> Signage[Signage active]
    Signage --> Alignment[Alignment mode approved]
    Alignment --> Log[Use logged]

• Laser class and wavelength confirmed
• Correct eyewear verified
• Beam path enclosed or controlled
• Warning signage active
• Interlocks active unless approved alignment exception
• Alignment procedure approved
• Nonessential personnel excluded
• Use logged

P.4 Embedded-control change checklist

flowchart LR
    Change[Control change] --> Timing[Timing impact]
    Change --> Calibration[Calibration impact]
    Change --> Safety[Safety impact]
    Change --> Telemetry[Telemetry impact]
    Change --> Rollback[Rollback ready]
    Rollback --> Release[Release decision]

• Change request linked to issue or decision record
• Firmware or FPGA version recorded
• Timing contract impact reviewed
• Calibration impact reviewed
• Target profile impact reviewed
• Safety interlock impact reviewed
• Telemetry impact reviewed
• Bench test complete
• Hardware canary complete
• Rollback package prepared
• Evidence annotation plan prepared

P.5 Post-change review

flowchart TB
    Release[Released change] --> Metrics[Review metrics]
    Metrics --> Regression{Regression?}
    Regression -- yes --> Rollback[Rollback and incident]
    Regression -- no --> Promote[Promote release]
    Promote --> Archive[Archive evidence]

Review these metrics after any control-layer change:

• gate quality proxies
• readout classification stability
• timing errors
• buffer underruns
• hardware error codes
• calibration drift
• benchmark canaries
• incident reports
• user-visible regressions