Quantum 5, 564 (2021). https://doi.org/10.22331/q-2021-10-19-564 We present a quantum error correcting code with $textit{dynamically generated logical qubits}$. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, our measurement patterns generate logical […]
Quantum 5, 563 (2021). https://doi.org/10.22331/q-2021-10-19-563 We study the quantum-classical correspondence of an experimentally accessible system of interacting bosons in a tilted triple-well potential. With the semiclassical analysis, we get a better understanding of the different […]
Quantum 5, 562 (2021). https://doi.org/10.22331/q-2021-10-14-562 Iterative decoders for finite length quantum low-density parity-check (QLDPC) codes are attractive because their hardware complexity scales only linearly with the number of physical qubits. However, they are impacted by […]
Quantum 5, 561 (2021). https://doi.org/10.22331/q-2021-10-07-561 Entanglement in symmetric quantum states and the theory of copositive matrices are intimately related concepts. For the simplest symmetric states, i.e., the diagonal symmetric (DS) states, it has been shown […]
Quantum 5, 560 (2021). https://doi.org/10.22331/q-2021-10-07-560 A leading proposal for verifying near-term quantum supremacy experiments on noisy random quantum circuits is linear cross-entropy benchmarking. For a quantum circuit $C$ on $n$ qubits and a sample $z […]
Quantum 5, 559 (2021). https://doi.org/10.22331/q-2021-10-06-559 To explore the possibilities of a near-term intermediate-scale quantum algorithm and long-term fault-tolerant quantum computing, a fast and versatile quantum circuit simulator is needed. Here, we introduce Qulacs, a fast […]
Quantum 5, 558 (2021). https://doi.org/10.22331/q-2021-10-05-558 Barren plateau landscapes correspond to gradients that vanish exponentially in the number of qubits. Such landscapes have been demonstrated for variational quantum algorithms and quantum neural networks with either deep […]
Quantum 5, 557 (2021). https://doi.org/10.22331/q-2021-10-05-557 Gate set tomography (GST) is a protocol for detailed, predictive characterization of logic operations (gates) on quantum computing processors. Early versions of GST emerged around 2012-13, and since then it […]
Quantum 5, 556 (2021). https://doi.org/10.22331/q-2021-09-29-556 We present a novel mapping for studying 2D many-body quantum systems by solving an effective, one-dimensional long-range model in place of the original two-dimensional short-range one. In particular, we address […]
Quantum 5, 555 (2021). https://doi.org/10.22331/q-2021-09-28-555 In a quantum measurement process, classical information about the measured system spreads throughout the environment. Meanwhile, quantum information about the system becomes inaccessible to local observers. Here we prove a […]
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