Agenda

You can adjust the timing of the agenda as needed to suit your class schedule.

1. Introduction: (5 mins) - This activity demonstrates the power of two important concepts in Quantum physics: quantum superposition and quantum entanglement. These two concepts are believed to be responsible for everything that exists in the universe, including all of space and time.
2. Play the game: (25 min) - Students are led through a series of chess puzzles by an animated, in-game character named Sph1r0.
3. Strategy reflection: (5-10 min) - Reflect with the students on how this game is different from other turn-based board games they might have played. How might they use superposition, measurement, and entanglement to create winning scenarios?
4. Quantum connection: (10-15 min) - Students can engage with your choice of a video that presents some amazing, real world applications of quantum computers.

Overview for the instructor

Chess has a reputation for being a game played by elite intellectuals. For this activity, we simply use the chess board as a tool to help students build intuition about otherwise abstract concepts. The students may think of the chess board and pieces as just common, physical objects. The chess pieces move on the board according to a simple set of rules that we introduce gently as the puzzles progress. No prior knowledge of chess is expected.

We hope that the students can imagine themselves touching the chess pieces. We use this sense of cognitive embodiment to support the idea that a system can be in more than one state with some probability. Rather than imagine a single board, ask your students to imagine multiple boards where a single piece can occupy a different square on each board.

The animated character in the activity (Sph1r0, pronounced: sphee-ro) introduces the chess board and some basic moves. Sph1r0 goes on to present a set of puzzles, where the students need to move a small set of chess pieces on a small region of the board, for a specific objective (capture, help your piece escape capture, and so on).

The puzzles offer an opportunity to enable students to consider the principles of quantum mechanics in an intuitive way. Almost everyone finds the mathematics of quantum mechanics unintuitive, at first. For those who go on to study quantum mechanics more deeply, we hope that the intuition that they build with this activity could provide a stronger foundation on which to build more thorough knowledge about the mathematics that define quantum mechanics. We hope that this activity makes their journey simpler and more engaging.

Introduction

You can use this script before the first lesson:

Play the game

• Ensure that you have a laptop or Chromebook for every one or two students.
• Ensure that you have access to https://iqim.caltech.edu/quantum-puzzles from your classroom.

Strategy reflection

One of the core activities of quantum information scientists is to uncover and express the behaviors of systems in terms of quantum physics. A quantum chemist might look at the electronic structure of atoms and molecules and try to describe them in terms of possible realities that interact with each other. If they're successful, they can program a quantum computer (as they become more useful) to do things like create new proteins and predict the result of complex chemical reactions.

The Quantum Chess puzzles prompt students to start building this habit of thinking about systems in terms of their possible states, and how those states depend on each other. The last two puzzles of Realm 2 (Measurement) and the first three puzzles of Realm 3 (Entanglement), in particular, encourage students to explore the interactions of multiple realities.

The strategy to solve these puzzles depends on students acquiring some familiarity with the quantum "moves" used in the puzzles:

Puzzles 2 and 3 in Realm 3 (Entanglement) are great examples of how some choices about the system drive very different outcomes. In both puzzles the same initial move yields very different possible outcomes, depending on the King's response.

The near King (square F1), cannot take the Rook under any circumstances. In mathematical terms, there is a zero percent chance of success. Why? For the Rook to land on square G1, it would need to pass through the square F1. If the King were on square F1, the Rook would not have moved. So, the Rook on G1 is entangled with the King on F1 (we've created one of the famous Bell states).

However, that doesn't guarantee success for the King on square H1. Since the King is in superposition, the system has two possible states. If the King from H1 tries to capture the Rook on G1, we trigger our Measurement rule (two different pieces try to occupy the same square). If the King is truly on H1, then:

• The King was not on square F1.
• The Rook passed through square F1 to reach G1.
• The King captures G1 from H1.

However, the measurement could have told us that we were in the other reality, where the King was on F1. In this case, the King on H1 is measured out of existence and the Rook is safe.

While Quantum Chess is just a game, it enables the player to start building intuition about quantum behaviors that one can go on to apply in other contexts.

All done? Jump to Quantum connection to conclude your class.

Lesson: Zeros and Ones

Zeros and Ones (a quantum Magic Square game) offers students a chance to understand the limitations of classical physics, and improve their chances at winning a game by using Quantum Information Science as an analytic tool. This activity highlights the limitations of classical systems analysis.

Run this activity

• Before class: print game sheets.
• Project the presentation slides.
• Play the pre-recorded facilitator (slide 3) to help set up the game.
• Once the game is over, continue with the class discussion guided by the presentation slides.
• Choose a conclusion (below).

Agenda

You can adjust the timing of the agenda as needed to suit your class schedule.

1. Introduction: (5 mins) - See language provided on our Quantime website.
2. Play the game: (25 min) - An engaging full-class activity that builds excitement around quantum concepts and fosters collaboration among students.
3. Strategy reflection: (5-10 min) - Students explore the best classical strategy to win the game. They learn that winning the game becomes exponentially harder with each additional round of play.
4. Quantum connection: (10-15 min) - Students 1.) revisit the Zeros and Ones game through an animation that recasts the game’s strategy in a quantum light, and 2.) watch a video presenting some of the amazing, real world applications of quantum computers.

Overview for the instructor

In a standard Magic Square game, a player is given 9 numbers and a 3 by 3 grid. The task is to fill in the grid with the numbers so that all rows, columns, and diagonals sum to a single number. A number of solutions exist to the Magic Square problem.

In the Quantum Magic Square game, the goal is for two sides (Red and Blue) of a group to coordinate the placement of the numbers 1 and 0 in a randomly chosen column and row, so that both groups choose the same number where the one's row and the other's column intersect.

The Blue side must populate their row with an even number of ones. The Red side must populate their column with an odd number of ones.

Three rows that meet the requirements for Zeros and Ones: 011, 110, 101.	Three columns that meet the requirements for Zeros and Ones: 010, 100, 111.
A pair of rolling dice
A winning play for the group, where the second row and first column were assigned. The Blue side chose 110, and the Red side chose 010. The row and column both have the number 1 at the intersection	A losing play for the group, where the second row and second column were assigned. The Blue side chose 110 and the Red side chose 100. The row and column have different numbers at the intersection.

The dice introduce an element of chance that makes the Zeros and Ones game virtually unwinnable if the game is played repeatedly.

However, if the students have access to a quantum system (like a small quantum computer), the quantum magic square game is winnable every time.

In this game, the class divides into four groups, each with two sides. A pre-recorded facilitator guides the entire class through the process.

Introduction

You can use this script before the first lesson:

If this is their first lesson, you can continue:

If they’ve already done the chess puzzles lesson, you can continue:

Play the game

Before you begin: Print at least one set of game play sheets for each group.

The pre-recorded facilitator leads the class through the following steps:

• Divide students into 4 groups, based on their location in the classroom.
• Choose a referee for each group (4 referees in total).
• Subdivide each group into two sides: Blue and Red.
• The pre-recorded facilitator explains the specifics of the game Zeros and Ones.
• After a demo round, each group has 3 minutes to strategize before the first round of play. If Red and Blue try to coordinate answers during the game, the group loses that round and is eliminated.
• If two or more groups are eliminated during play, the game ends.
• If 3 or more groups remain after 4 rounds, the teacher declares the class the winner.

Strategy reflection

Jump to the:

• Strategy Discussion slides
• Strategy video

To win the game, every row needs an even number of 1s and every column needs an odd number of 1s. However, there's always one square that can't be filled in without breaking the rules. This means that there is only an 8/9 chance of winning any given round, or about 89%.

We can write the probability for any one team winning four rounds in a row:

Or, more generally, for winning n games in a row:

Now we can write the probability of at least three groups winning all four rounds:

Earlier, we calculated that the probability of winning all four rounds was $$\left( \frac{8}{9} \right)^4$$, so substituting that into our equation:

As we build machines, such as quantum computers, that enable us to access the quantum realm, you can play this game in a way where you win 100% of the time.

This video describes briefly how we can use quantum superposition and entanglement to win the game every time. Soon, you will be able to play the game of Zeros and Ones on actual quantum computers and see for yourselves how all this works.

Quantum connection

Below are some suggested resources that you can use to close your lesson:

Practical applications

This outro is about some of the fascinating real world applications of the quantum concepts the students learned. Before leading this workshop, feel free to watch all of the videos and decide which would be most appropriate for your class, or ask the class to choose! We love them all so we couldn’t choose just one.

• What if we had working quantum computers today? (5:03)
• Quantum Computers Explained - Limits of Human Technology (6:45, can start at 3:45 if too long)
• How Quantum Computing Will Change the World (3:37)

Quantum in Hollywood

This video pits actor Paul Rudd (Marvel’s Ant-Man) against theoretical physicist Stephen Hawking in an epic game of quantum chess.

This video can be watched after either lesson but we recommend showing it after the students have been introduced to the chess puzzles. It’s a bit long but serves as a fun note to end on. If there is not enough time, we recommend sending the link home with your students so they can watch it on their own time.

If the students are not familiar with Ant-Man, explain that he is a Marvel superhero that has a special suit allowing him to enter the Quantum Realm. If the students are not familiar with Stephen Hawking, explain that he is a famous theoretical physicist, who tried to figure out the Theory of Everything - how gravity works at the quantum level.

• Stephen Hawking faces Paul Rudd in epic chess match (feat. Keanu Reeves) (11:50)

Find out more

Our classroom time with quantum physics is coming to an end but hopefully this was an enticing introduction to the quantum world.

There is so much more to learn about this topic that we weren’t able to cover in this lesson. The study of quantum physics is vast and ever-growing, and if you’d like to continue your journey with it, there are many ways:

• Explore the Quantum Chess playground
• Learn More about Quantum Science:
  • Caltech Quantum Physics explainers
  • Other Quantime activities at the Q12 Partnership
  • Explore the Quantum Atlas

Standards alignment

For teachers in the United States, you should find that these lessons align with the Next Generation Science Standards :

Both lessons aim to help students build intuition about using quantum systems to reason about the encoding and transmission of digital information.