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@josh146 josh146 released this 15 Jan 06:26
· 127 commits to master since this release
v0.17.0
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New features since last release

  • TDMProgram objects can now be compiled and submitted via the API. (#476)

  • Wigner functions can be plotted directly via Strawberry Fields using Plot.ly. (#495)

    prog = sf.Program(1)
eng = sf.Engine('fock', backend_options={"cutoff_dim": 10})

with prog.context as q:
    gamma = 2
    Vgate(gamma) | q[0]

state = eng.run(prog).state

xvec = np.arange(-4, 4, 0.01)
pvec = np.arange(-4, 4, 0.01)
mode = 0

sf.plot_wigner(state, mode, xvec, pvec, renderer="browser")

  • Fock state marginal probabilities can be plotted directly via Strawberry Fields using Plot.ly. (#510)

    prog = sf.Program(1)
eng = sf.Engine('fock', backend_options={"cutoff_dim":5})

with prog.context as q:
    Sgate(0.5) | q[0]

state = eng.run(prog).state
state.all_fock_probs()

modes = [0]

sf.plot_fock(state, modes, cutoff=5, renderer="browser")

  • Position and momentum quadrature probabilities can be plotted directly via Strawberry Fields using Plot.ly. (#510)

    prog = sf.Program(1)
eng = sf.Engine('fock', backend_options={"cutoff_dim":5})

with prog.context as q:
    Sgate(0.5) | q[0]

state = eng.run(prog).state

modes = [0]
xvec = np.arange(-4, 4, 0.1)
pvec = np.arange(-4, 4, 0.1)

sf.plot_quad(state, modes, xvec, pvec, renderer="browser")

  • Strawberry Fields code can be generated from a program (and an engine) by calling sf.io.generate_code(program, eng=engine). (#496)

Improvements

  • Connection objects now send versioned requests to the platform API. (#512)

  • TDMProgram allows application of gates with more than one symbolic parameter. #492

  • The copies option, when constructing a TDMProgram, has been removed. Instead, the number of copies of a TDM algorithm can now be set by passing the shots keyword argument to the eng.run() method. (#489)

    >>> with prog.context([1, 2], [3, 4]) as (p, q):
...     ops.Sgate(0.7, 0) | q[1]
...     ops.BSgate(p[0]) | (q[0], q[1])
...     ops.MeasureHomodyne(p[1]) | q[0]
>>> eng = sf.Engine("gaussian")
>>> results = eng.run(prog, shots=3)

    Furthermore, the TDMProgram.unrolled_circuit attribute now only contains the single-shot unrolled circuit. Unrolling with multiple shots can still be specified via the unroll method: TDMProgram.unroll(shots=60).

  • The Result.samples returned by TDM programs has been updated to return samples of shape (shots, spatial modes, timebins) instead of (shots, spatial modes * timebins). (#489)

  • A sample post-processing function is added that allows users to move vacuum mode measurements from the first shots to the last shots, and potentially crop out the final shots containing these measurements. (#489)

  • pytest-randomly is added to the SF tests. (#480)

  • TDMProgram objects can now be serialized into Blackbird scripts, and vice versa. (#476)

Breaking Changes

  • Jobs are submitted to the Xanadu Quantum Cloud through a new OAuth based authentication flow using offline refresh tokens and access tokens. (#520)

Bug fixes

  • Fixes a bug where Dgate, Coherent, and DisplacedSqueezed do not support TensorFlow tensors if the tensor has an added dimension due to the existence of batching. (#507)

  • Fixes an issue with reshape_samples where the samples were sometimes reshaped in the wrong way. (#489)

  • The list of modes is now correctly added to the Blackbird program when using the io.to_blackbird function. (#476)

  • Fixes a bug where printing the Result object containing samples from a time-domain job would result in an error. Printing the result object now correctly displays information about the results. (#493)

  • Removes the antlr4 requirement due to version conflicts. (#494)

  • TDMProgram.run_options is now correctly used when running a TDM program. (#500)

  • Fixes a bug where a single parameter list passed to the TDMProgram context results in an error. (#503)

Documentation

  • TDMProgram docstring is updated to make it clear that only Gaussian programs are allowed. (#519)

  • Clarifies special cases for the MZgate in the docstring. (#479)

Contributors

This release contains contributions from (in alphabetical order):

Tom Bromley, Jack Brown, Theodor Isacsson, Josh Izaac, Fabian Laudenbach, Tim Leisti, Nicolas Quesada, Antal Száva.

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