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Stage 3 · Lesson 10 of 17

What quantum teleportation really transfers

40 minutesNo coding required10-question quiz

1 · Big question

What moves during quantum teleportation, and what definitely does not?

  • State that teleportation transfers quantum-state information, not matter.
  • Identify the message qubit, shared entangled pair, two measurements and two classical bits.
  • Choose the correct receiver correction.
  • Explain no-cloning and the need for classical communication.

2 · Before we begin

Ideas to bring with you

  • Entanglement is a joint-state resource, not a message channel.
  • Measurement produces classical bits.

3 · New words

Meet the words before we use them

quantum teleportation
A protocol that reconstructs a quantum state elsewhere using shared entanglement, measurement and classical communication.
classical channel
An ordinary communication path that carries classical bits.
correction
An X, Z, both or neither operation chosen from the two classical results.

4 · Simple explanation

Build one idea at a time

Quantum teleportation transfers quantum-state information. It does not transport a person, object, atom or the message qubit itself.

Alice and Bob first share an entangled pair. Alice interacts the unknown message qubit with her shared qubit, measures two qubits, and sends Bob two ordinary classical bits.

Bob uses those bits to choose a correction. Only then does his qubit have the input state. The original unknown state is no longer available as an extra perfect copy, and the classical channel prevents faster-than-light use.

Watch it happen

Three-qubit teleportation stepper

Calculated teaching model

Follow Message, Alice share and Bob share through entanglement, measurement, classical communication and correction.

Ready. Use Step or Play to begin.
Text description of the animation

Three labelled lanes show an input state, a shared Bell pair, two Alice measurement bits travelling on an ordinary classical channel, and Bob applying I, X, Z or XZ. No particle moves lanes and no extra input copy remains.

  1. Choose an input preset and prepare the shared entangled pair.
  2. Step through Alice’s operations and two measurements.
  3. Send the two classical bits and apply the matching correction at Bob.

Evidence to calculate or record: For each branch, Bob’s corrected state matches the chosen input while the original is not retained as a second copy.

Predict

Commit to an idea before the reveal

Before the classical bits reach Bob, can Bob know which correction will reconstruct the state?

Choose a prediction to enable the experiment.

Try it

Trace all four correction branches

Teaching model

Choose an input preset and prepare the shared entangled pair.

Make and lock a prediction first.

Detailed activity results will appear here.
Bit-order legend

Pi Leo labels wires q0, q1 and q2 from top to bottom. In displayed result strings, the highest-numbered bit is written on the left, so a two-qubit result is shown as q1q0. This matches the convention used in the Pi Leo simulator and common Qiskit count strings.

8 · Observe

What did the result actually show?

Look at the displayed values before reading the explanation. Record a pattern, an exception or something that changed.

Alice’s two results vary across branches. Before Bob receives them, his local data does not reveal the input; after the matching correction, the ideal receiver state matches it.

9 · Explain the result

Connect the evidence to the idea

Entanglement supplies a shared quantum resource, while two classical bits select the correction. The protocol consumes the original state and cannot outrun the classical message.

10 · Model and limitation

Useful model, honest boundary

What this model shows

The three lanes accurately track information roles and prevent matter-transfer imagery.

What this model does not show

The coloured state pattern is a mathematical state description, not a substance or particle travelling from Alice to Bob.

11 · Common mix-ups

Careful wording prevents big mistakes

Teleportation beams a person or atom.

The protocol transfers state information, not matter.

Entanglement removes the need for classical communication.

Two classical bits are essential before the receiver can reconstruct the state.

Teleportation leaves two perfect copies.

The original unknown state is consumed; no-cloning is respected.

12 · Real quantum-computing connection

Where this appears in circuit work

Teleportation is used as a quantum-network protocol and as a circuit technique, but every implementation requires physical resources, operations, measurements and ordinary communication.

13 · Show me moreOptional deeper explanation

Show me more

Write Alice’s results as message-qubit bit first and Alice-share bit second. For 00, 01, 10 or 11 in that order, Bob applies respectively I, X, Z or X then Z.

Try this

Explain the deeper idea in your own words, including one limitation.

14 · Quick summary

Keep these ideas

  • Teleportation transfers state information, not matter.
  • It uses pre-shared entanglement and two classical bits.
  • Bob applies a result-dependent correction.
  • The original state is not left as an extra copy.

Ten-question quiz

Check the ideas—not decorative details

Feedback appears after submission. Retry whenever you like; 8/10 or above means “Topic understood”.

1What does quantum teleportation transfer?

Concept · Easy

2Which set of resources is required?

Concept · Medium

3What happens to the original unknown state?

Concept · Medium

4What travels through the classical channel?

Vocabulary · Easy

5What is Bob’s correction?

Vocabulary · Easy

6Using the stated message-bit-first table, which correction follows Alice’s result 01?

Prediction · Medium

7What can Bob recover before Alice’s two bits arrive?

Prediction · Medium

8An animation draws the input qubit as a parcel flying to Bob. Which replacement is scientifically safer?

Misconception · Easy

9Which test best checks every ideal correction branch?

Evidence · Hard

10A diagram shows entanglement and Bob’s correction but no classical channel. What is wrong?

Application · Medium

Sources and accuracy notes3 checked references · reviewed 2026-08-15

These records identify the claim each source supports. External documentation can change; dated platform claims were checked on the shown access date.

  1. Basics of Quantum InformationIBM Quantum Learning · Course overview and units · accessed 2026-08-15

    Supports quiz questions ql-10-q-01, ql-10-q-02, ql-10-q-04, ql-10-q-05, ql-10-q-08, ql-10-q-10 and their related lesson explanations about classical and quantum information; quantum circuits; entanglement and teleportation.

  2. Entanglement and correlationsMicrosoft Learn · Entanglement and correlation · accessed 2026-08-02

    Supports quiz questions ql-10-q-07 and their related lesson explanations about compound-system states; entanglement; quantum correlations.

  3. Quantum Computation and Quantum InformationCambridge University Press · 2010 · Sections 1.2–1.3 and Chapters 4, 6 and 8 · accessed 2026-08-02

    Supports quiz questions ql-10-q-03, ql-10-q-06, ql-10-q-09 and their related lesson explanations about quantum states and circuits; quantum algorithms; teleportation, noise and error correction.

Lesson accuracy notes
  • This model is deliberately limited: The coloured state pattern is a mathematical state description, not a substance or particle travelling from Alice to Bob.
  • Predictions, simulations and physical-hardware evidence are labelled separately.