Quantum 5, 439 (2021). https://doi.org/10.22331/q-2021-04-26-439 The exchange of information between an open quantum system and its environment allows us to discriminate among different kinds of dynamics, in particular detecting memory effects to characterize non-Markovianity. Here, […]
The world’s biggest AI chip just doubled its specs—without adding an inch. The Cerebras Systems Wafer Scale Engine is about the size of a big dinner plate. All that surface area enables a lot more […]
Quantum 5, 438 (2021). https://doi.org/10.22331/q-2021-04-22-438 We introduce “fractalization”, a procedure by which spin models are extended to higher-dimensional “fractal” spin models. This allows us to interpret type-II fracton phases, fractal symmetry-protected topological phases, and more, […]
Quantum 5, 437 (2021). https://doi.org/10.22331/q-2021-04-20-437 The $p$-stage Quantum Approximate Optimization Algorithm (QAOA$_p$) is a promising approach for combinatorial optimization on noisy intermediate-scale quantum (NISQ) devices, but its theoretical behavior is not well understood beyond $p=1$. […]
Quantum 5, 436 (2021). https://doi.org/10.22331/q-2021-04-20-436 Suppose we want to implement a unitary $U$, for instance a circuit for some quantum algorithm. Suppose our actual implementation is a unitary $tilde{U}$, which we can only apply as […]
Quantum 5, 435 (2021). https://doi.org/10.22331/q-2021-04-20-435 We investigate the conditions under which an uncontrollable background processes may be harnessed by an agent to perform a task that would otherwise be impossible within their operational framework. This […]
Quantum 5, 434 (2021). https://doi.org/10.22331/q-2021-04-19-434 The hybrid quantum-classical algorithm is actively examined as a technique applicable even to intermediate-scale quantum computers. To execute this algorithm, the hardware efficient ansatz is often used, thanks to its […]
Engineering giant Honeywell burst into the quantum computing race out of left field last year. Now the company has provided the first concrete details of how its device works in a peer-reviewed journal. Unlike its […]
Quantum 5, 433 (2021). https://doi.org/10.22331/q-2021-04-15-433 We significantly reduce the cost of factoring integers and computing discrete logarithms in finite fields on a quantum computer by combining techniques from Shor 1994, Griffiths-Niu 1996, Zalka 2006, Fowler […]
Quantum 5, 432 (2021). https://doi.org/10.22331/q-2021-04-15-432 Hypergraph product codes are a class of constant-rate quantum low-density parity-check (LDPC) codes equipped with a linear-time decoder called small-set-flip (SSF). This decoder displays sub-optimal performance in practice and requires […]
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