Name: Cirqを使った量子コンピュータのプログラミング (QuantumCasts) (Programming a quantum computer with Cirq (QuantumCasts))
Uploaded: 2021-01-14T10:02:56.000Z
Duration: 10 min 40 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

DAVE BACON: A quantum computer is a new type of computer

that stores and acts on information in its quantum

Today, we are entering into an exciting era

to execute tasks in less than a second that

would take years to execute on a normal computer.

This is a quantum computer made of superconducting circuits

Google's researchers are using this chip to attempt to achieve

a task that cannot be solved in years on a supercomputer.

I run the team that builds software for Google's quantum

And today, I'd like to tell you a little bit about how

We do this using an open source framework called Cirq.

A quantum computer stores its information using quantum bits,

maneuvered around using the laws of quantum physics.

To describe an algorithm on a quantum computer,

you would use what is called the quantum circuit model.

a diagram describing how to perform a quantum computation.

You read this diagram like a sheet of music

to quantum gates that are applied to one or more qubits,

depending on how many wires the box is connected to.

Quantum gates are instructions to send control signals

to the quantum computer to perform a certain quantum

Finally, one has instructions for reading out

This corresponds to quantum gates that perform measurements

and turn quantum bits into classical bits.

we can use this diagram to send microwave pulses

and instructions to our quantum computing hardware

As we sweep from left to right, we play the given gates

The quantum circuit diagram is cool looking.

But of course, if we had to draw a diagram to do this,

and we are writing really long quantum programs,

this would quickly become very challenging to do.

have developed frameworks, or programming languages,

to write more traditional looking programs that

An open source framework that we use at Google for this effort

Welcome to the [? Cirqus. ?] Let's write a simple circuit.

This means you can use all the goodness of Python

in helping to write your quantum program.

The central object in Cirq is a circuit object.

Let's define two qubits with simple names.

Now we can perform some quantum gates on these qubits.

Let's apply a single qubit Hadamard gate denoted by H

to one of the qubits, followed by a two qubit controlled

But ASCII diagrams are useful for seeing the quantum circuit

that you've built. Here we see the H gate for a Hadamard,

followed by the controlled NOT gate with the ampersand symbol

And finally, the measurements represented by M.

Once we've constructed a quantum circuit, what do we do with it?

Here we run the circuit 10 times and see the measurement

don't always give the same values of bits.

One run of the circuit may result in the output being 0,

Here we see that the measurement results differ

Cirq also contains an interface for running the quantum circuit

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Cirqを使った量子コンピュータのプログラミング (QuantumCasts) (Programming a quantum computer with Cirq (QuantumCasts))

essentially

simultaneously

practical

aware