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Hot answers tagged rigetti

12

Bristlecone's native operation is the CZ, not CNOTs. However, you can transform between the two with Hadamard gates so this is sort of a trivial difference. Bristlecone can perform a CZ between any adjacent pair of qubits on a grid. You can see the grid by installing cirq and printing out the Bristlecone device: $pip install cirq$ python >>> ...

9

From the original blog post presenting the Bristlecone quantum chip, here is the connectivity map of the chip: Each cross represent a qubit, with nearest-neighbour connectivity. If you number the qubits from left to right, top to bottom (just like how you read english), starting by $0$ then the connectivity map would be given by: connectivity_map = { i ...

4

For Qiskit, there are two tools you can check out. The two qubit kak tool does exactly what you want for 2 qubits. If you give it a two qubit unitary, it gives you a list of gates to realize this, using the standard gate set used in Qiskit. This tool uses Vatan and Williams optimal two-qubit circuit. The decomposition algorithm used is explained in Drury ...

3

It's likely that this algorithm hasn't yet been implemented in QISKit / Q# / pyquil etc. It's also important to note that you would not be discovering new Mersenne primes with a quantum computer - the paper referenced says: We propose a quantum circuit that creates a pure state corresponding to the quantum superposition of all prime numbers less than $2^n$...

3

For amplitude damping, $\gamma$ is something like $e^{-\Delta t/T_1}$ where $\Delta t$ is how long the Kraus operator is supposed to act. But be very careful, Kraus evolution assumes your system has no initial correlations, that every qubit interacts with identical baths and that every qubit is identical. All the assumptions are most likely violated and so ...

2

The current version of PyQuil provides an "ISA" object that houses the information that you want about Rigetti's quantun processors, but it isn't formatted as you request. I'm a poor Python programmer, so you'll have to excuse my non-Pythonic-ness—but here's a snippet that will take a device_name and reformat the pyQuil ISA into one of your dictionaries: ...

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