PennyLane plugin for ProjectQ
PennyLane is a cross-platform Python library for quantum machine learning, automatic differentiation, and optimization of hybrid quantum-classical computations.
ProjectQ is an open-source compilation framework capable of targeting various types of hardware and a high-performance quantum computer simulator with emulation capabilities, and various compiler plug-ins.
This PennyLane plugin allows to use both the software and hardware backends of ProjectQ as devices for PennyLane.
- Provides three devices to be used with PennyLane: projectq.simulator, projectq.ibm, and projectq.classical. These provide access to the respective ProjectQ backends.
- Supports a wide range of PennyLane operations and observables across the devices.
- Combine ProjectQ high performance simulator and hardware backend support with PennyLane’s automatic differentiation and optimization.
This plugin requires Python version 3.5 and above, as well as PennyLane and ProjectQ. Installation of this plugin, as well as all dependencies, can be done using pip:
$ python -m pip install pennylane_pq
To test that the PennyLane ProjectQ plugin is working correctly you can run
$ make test
in the source folder. Tests restricted to a specific device can be run by executing
make test-ibm, or
Tests on the ibm device can only be run if a
password for the IBM Q experience are configured in the PennyLane configuration file. If this is the case, running
make test also executes tests on the
ibm device. By default tests on the
ibm device run with
hardware=False. At the time of writing this means that the test are “free”. Please verify that this is also the case for your account.
You can instantiate a
'projectq.simulator' device for PennyLane with:
import pennylane as qml dev = qml.device('projectq.simulator', wires=2)
This device can then be used just like other devices for the definition and evaluation of QNodes within PennyLane. A simple quantum function that returns the expectation value of a measurement and depends on three classical input parameters would look like:
@qml.qnode(dev) def circuit(x, y, z): qml.RZ(z, wires=) qml.RY(y, wires=) qml.RX(x, wires=) qml.CNOT(wires=[0, 1]) return qml.expval(qml.PauliZ(wires=1))
You can then execute the circuit like any other function to get the quantum mechanical expectation value.
circuit(0.2, 0.1, 0.3)
Running your code on an IBM Quantum Experience simulator or even a real hardware chip is just as easy. Instead of the device above, you would instantiate a
'projectq.ibm' device by giving your IBM Quantum Experience username and password:
import pennylane as qml dev = qml.device('projectq.ibm', wires=2, user="XXX", password="XXX")
In order to avoid accidentally publishing your credential, you should better specify them via the PennyLane configuration file by adding a section such as
[projectq.global] [projectq.ibm] user = "XXX" password = "XXX"
How to cite
If you are doing research using PennyLane, please cite our whitepaper:
Ville Bergholm, Josh Izaac, Maria Schuld, Christian Gogolin, and Nathan Killoran. PennyLane. arXiv, 2018. arXiv:1811.04968
We welcome contributions - simply fork the repository of this plugin, and then make a pull request containing your contribution. All contributers to this plugin will be listed as authors on the releases.
We also encourage bug reports, suggestions for new features and enhancements, and even links to cool projects or applications built on PennyLane.
- Source Code: https://github.com/XanaduAI/pennylane-pq
- Issue Tracker: https://github.com/XanaduAI/pennylane-pq/issues
If you are having issues, please let us know by posting the issue on our Github issue tracker.
The PennyLane ProjectQ plugin is free and open source, released under the Apache License, Version 2.0.
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