Quantum Computing Stack Exchange
Quantum Computing Stack Exchange

Questions tagged [pyquil]

A Python library for quantum programming using Quil. http://docs.rigetti.com

15 questions
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2 answers

Hamiltonian simulation with complex coefficients

As part of a variational algorithm, I would like to construct a quantum circuit (ideally with pyQuil) that simulates a Hamiltonian of the form: $H = 0.3 \cdot Z_3Z_4 + 0.12\cdot Z_1Z_3 + [...] + - 11.03 \cdot Z_3 - 10.92 \cdot Z_4 + \mathbf{0.12i…
Mark Fingerhuth
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6
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1 answer

How to create the oracle matrix in Grover's algorithm?

I'm trying to implement Grover's algorithm in pyQuil, but I'm having trouble creating the oracle matrix given the function $f$, where $f(x)=1$ if $x=w$ and $f(x)=0$ otherwise. In most of the implementations I've seen, either a mysterious oracle…
user5694
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6
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2 answers

Measuring the Hamiltonian in the VQE

I am trying to implement VQE in pyQuil and am dumbfounded by how to measure the expectation value of a general Hamiltonian on $\mathbb{C}^{2^n}$ i.e. determine $\langle\psi , H \psi\rangle$ on a Quantum computer. As far as I understand on a real…
Jan Lukas Bosse
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5
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1 answer

Bloch sphere visualization using Cirq, ProjectQ, PyQuil

Is there a way to visualize the Bloch sphere using Cirq, ProjectQ, and/or PyQuil, as it is possible using plot_bloch_vector in Qiskit?
Marija Scekic
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3
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0 answers

Error during Forest OpenFermion installation

I tried installing Forest OpenFermion by pip install forestopenfermion and I got the following long error message (cut): Building wheels for collected packages: scipy Building wheel for scipy (setup.py) ... error ERROR: Command errored out with…
Michelle
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3
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1 answer

Newbie Project: Calculate a Mersenne Prime with Quantum Computing

I am new to the quantum world and wondering the bounds of which the technology is at the current state of the art: specifically in computing prime numbers. I would like to, if possible, create a project that seeks to find Mersenne prime numbers (see…
Daniel Connelly
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3
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1 answer

Where can I find a comprehensive list of gate decompositions used by transpilers?

Does anyone know of a web site, paper etc. that has a list of "gate decompositions" e.g. the kind of decompositions that occur when the transpiler decomposes non-native gates to native gates. This document is really nice and has some decompositions,…
John
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Pyquil run_and_measure gives the same output across all the trials: is this expected?

I tried to run the starter program demonstrated on this page: http://docs.rigetti.com/en/stable/start.html#installing-the-qvm-and-compiler-on-linux-deb With the following code: # construct a Bell State program p = Program(H(0), CNOT(0, 1)) # run…
abracadabra12345
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How to get the $T1$ specs for the Rigetti's quantum processor (Aspen 7)

I am trying to find the $T1$ coherence time for different qubits of Rigetti's quantum processor (Aspen 7) using Python. I tried using Specs() but encountered an error.
SHASHANK RANU
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1
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2 answers

Can simulations of a quantum algorithm on a classical computer out-perform a classical algorithm?

Has it ever been shown that simulation of a quantum algorithm (e.g., using PyQuil or something?) on a classical computer has out-performed a purely classical algorithm? From what I can tell the answer is no, given the large memory, etc., for a…
IsalanOnkar
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1 answer

Which method does pyQuil use to compile a Program?

I want to find out which method different compilers use to decompose a matrix into smaller gates. I went through the pyQuil code on github but could not find the answer there. Maybe i lost track of something. I would by highly interested in the…
Qubii
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Is there a method in pyQuil to create logical boolean gates

is there another way to represent a boolean gate. The straight forward way would be to define a gate my a matrix and then apply this gate to the circuit. What i mean by that? For Example an AND-Gate is nothing Else then a CCX-Gate. So we want Qubit1…
Qubii
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1
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1 answer

How to create a qubit in an arbitrary state in PyQuil

In PyQuil, a qubit is initialised as $|0\rangle$ by default. Suppose, I want to initialise a qubit in an arbitrary state, say $\frac{1}{\sqrt{3}}|0\rangle+\sqrt{\frac{2}{3}}|1\rangle$. How to do this arbitrary qubit initialisation in PyQuil?
SHASHANK RANU
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1 answer

How to set different Backend Layouts in TKET and pyQuil (Quil compiler)?

In Qiskit it is possible to describe a CouplingMap on which a circuit get executed. This helps with testing different Layouts. There are many possibilities in Qiskit on how to do this. Firstly you can create a CouplingMapInstance and then create…
Qubii
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0
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VQE for Beginners : Using Tutorial and Cirq

I have been following this tutorial: https://dkopczyk.quantee.co.uk/vqe/ I am using Cirq to try to teach myself VQE, replicate their results, and also try to understand more about ansatz for molecular simulations - and just for plain fun! Here's the…
Enrique Segura
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