Quantum 8, 1496 (2024). https://doi.org/10.22331/q-2024-10-10-1496 We develop three new methods to implement any Linear Combination of Unitaries (LCU), a powerful quantum algorithmic tool with diverse applications. While the standard LCU procedure requires several ancilla qubits […]
Quantum 8, 1495 (2024). https://doi.org/10.22331/q-2024-10-10-1495 There has been much recent interest in near-term applications of quantum computers, i.e., using quantum circuits that have short decoherence times due to hardware limitations. Variational quantum algorithms (VQA), wherein […]
Quantum 8, 1494 (2024). https://doi.org/10.22331/q-2024-10-10-1494 Quantum Darwinism builds on decoherence theory to explain the emergence of classical behavior in a fundamentally quantum universe. Within this framework we prove two crucial insights about the emergence of […]
Quantum 8, 1493 (2024). https://doi.org/10.22331/q-2024-10-04-1493 The computational capabilities of near-term quantum computers are limited by the noisy execution of gate operations and a limited number of physical qubits. Hybrid variational algorithms are well-suited to near-term […]
Quantum 8, 1492 (2024). https://doi.org/10.22331/q-2024-10-04-1492 We prove that the stabilizer fidelity is multiplicative for the tensor product of an arbitrary number of single-qubit states. We also show that the relative entropy of magic becomes additive […]
Quantum 8, 1491 (2024). https://doi.org/10.22331/q-2024-10-04-1491 ZX-calculus has proved to be a useful tool for quantum technology with a wide range of successful applications. Most of these applications are of an algebraic nature. However, other tasks […]
Quantum 8, 1490 (2024). https://doi.org/10.22331/q-2024-10-03-1490 The Born rule describes the probability of obtaining an outcome when measuring an observable of a quantum system. As it can only be tested by measuring many copies of the […]
Quantum 8, 1489 (2024). https://doi.org/10.22331/q-2024-10-02-1489 Investigations of the boundary of the quantum correlation set have gained increased attention in recent years. This is done through the derivation of quantum Bell inequalities, which are related to […]
Quantum 8, 1488 (2024). https://doi.org/10.22331/q-2024-10-02-1488 We establish the concept of topological pumping in one-dimensional systems with long-range couplings and apply it to the transport of a photon in quantum optical systems. In our theoretical investigation, […]
Quantum 8, 1487 (2024). https://doi.org/10.22331/q-2024-10-02-1487 Quantum phase estimation is one of the most powerful quantum primitives. This work proposes a new approach for the problem of multiple eigenvalue estimation: Quantum Multiple Eigenvalue Gaussian filtered Search […]
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