New features since last release
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A new device,
strawberryfields.remote, provides support for Xanadu's photonic hardware from within PennyLane. (#41)dev = qml.device('strawberryfields.remote', backend="X8", shots=10, sf_token="XXX")
Once created, the device can be bound to photonic QNode for evaluation and training:
@qml.qnode(dev) def quantum_function(theta, x): qml.TwoModeSqueezing(1.0, 0.0, wires=[0, 4]) qml.TwoModeSqueezing(1.0, 0.0, wires=[1, 5]) qml.Beamsplitter(theta, phi, wires=[0, 1]) qml.Beamsplitter(theta, phi, wires=[4, 5]) return qml.expval(qml.NumberOperator(0))
Samples can also be returned from the hardware using
return [qml.sample(qml.NumberOperator(i)) for i in [0, 1, 2, 4]]
For more details, please see the remote device documentation
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The Strawberry Fields devices now support returning Fock state probabilities. (#39)
@qml.qnode(dev) def quantum_function(theta, x): qml.TwoModeSqueezing(1.0, 0.0, wires=[0, 1]) return qml.probs(wires=0)
If a subset of wires are requested, the marginal probabilities will be computed and returned. The returned probabilities will have the shape
[cutoff] * wires.If not specified when instantiated, the cutoff for the Gaussian simulator is by default 10.
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Added the ability to compute the expectation value and variance of tensor number operators (#37) (#42)
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The Strawberry Fields devices now support custom wire labels. (#48)
dev = qml.device('strawberryfields.gaussian', wires=['alice', 1]) @qml.qnode(dev) def circuit(x): qml.Displacement(x, 0, wires='alice') qml.Beamsplitter(wires=['alice', 1]) return qml.probs(wires=[0, 1])
Improvements
- PennyLane-SF has been updated to support the latest version of Strawberry Fields (v0.15) (#44)
Contributors
This release contains contributions from (in alphabetical order):
Josh Izaac, Maria Schuld, Antal Száva