Quantum 5, 422 (2021). https://doi.org/10.22331/q-2021-03-29-422 Parametric quantum circuits play a crucial role in the performance of many variational quantum algorithms. To successfully implement such algorithms, one must design efficient quantum circuits that sufficiently approximate the […]
Quantum 5, 421 (2021). https://doi.org/10.22331/q-2021-03-25-421 Translations between the quantum circuit model and the measurement-based one-way model are useful for verification and optimisation of quantum computations. They make crucial use of a property known as gflow. […]
Quantum 5, 420 (2021). https://doi.org/10.22331/q-2021-03-23-420 In this paper we consider deterministic nonlinear time evolutions satisfying so called convex quasi-linearity condition. Such evolutions preserve the equivalence of ensembles and therefore are free from problems with signaling. […]
Quantum 5, 419 (2021). https://doi.org/10.22331/q-2021-03-23-419 We define the type-independent resource theory of local operations and shared entanglement (LOSE). This allows us to formally quantify postquantumness in common-cause scenarios such as the Bell scenario. Any nonsignaling […]
Quantum 5, 418 (2021). https://doi.org/10.22331/q-2021-03-23-418 Self-testing protocols are methods to determine the presence of shared entangled states in a device independent scenario, where no assumptions on the measurements involved in the protocol are made. A […]
Quantum 5, 417 (2021). https://doi.org/10.22331/q-2021-03-23-417 Here we study the comparative power of classical and quantum learners for generative modelling within the Probably Approximately Correct (PAC) framework. More specifically we consider the following task: Given samples […]
Quantum 5, 416 (2021). https://doi.org/10.22331/q-2021-03-23-416 Today’s most widely used method of encoding quantum information in optical qubits is the dual-rail basis, often carried out through the polarisation of a single photon. On the other hand, […]
Quantum 5, 415 (2021). https://doi.org/10.22331/q-2021-03-22-415 Quantum computing systems need to be benchmarked in terms of practical tasks they would be expected to do. Here, we propose 3 “application-motivated” circuit classes for benchmarking: deep (relevant for […]
Quantum 5, 414 (2021). https://doi.org/10.22331/q-2021-03-17-414 Quantum measurement is a basic tool to manifest intrinsic quantum effects from fundamental tests to quantum information applications. While a measurement is typically performed to gain information on a quantum […]
Quantum 5, 413 (2021). https://doi.org/10.22331/q-2021-03-16-413 We introduce an approximate description of an $N$-qubit state, which contains sufficient information to estimate the expectation value of any observable to a precision that is upper bounded by the […]
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