# Learner lab record: Complete quantum-cycle work and reset ledger

Course: Quantum-energy technology seminar

Name: ____________________  Date: ____________________  Group: ____________________

## Investigation question

Does a driven quantum protocol deliver positive net work after state preparation, measurement, feedback, control, and reset return every resource to its initial condition?

## Setup

Use the complete-cycle energy ledger. Define the system boundary and initial state, record each protocol stage, and require the working medium, controller, memory, and reservoirs to return to their declared initial conditions.

## Variables

| Variable | Role | Unit |
| --- | --- | --- |
| State preparation and pump work | cycle inputs | J |
| Extracted work | cycle output | J |
| Measurement, feedback, erasure, reset | control inputs | J |
| Net cyclic work and state closure | dependent decision | J and pass/hold |

## Predict before changing controls

1. Predict the ideal reversible net when all resources return to their initial state.

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2. Identify which omitted controller term could reverse the sign of the result.

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## Observation table

| stage | system ΔE | work in | work out | heat | information/control | state returned? |
| --- | --- | --- | --- | --- | --- | --- |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |

## Analyze

1. Does the ledger close energy at every stage?

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2. Which resource supplies nonequilibrium free energy?

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3. Is measurement memory reset included?

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4. What classical protocol is the correct performance benchmark?

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## Evidence-bounded conclusion

The protocol delivered gross ___ J but required ___ J preparation/control/reset; final state closure was ___ and complete-cycle net was ___ J versus benchmark ___.

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