Quantum 9, 1932 (2025). https://doi.org/10.22331/q-2025-12-10-1932 The existence and degeneracies of quantum exceptional, diabolical, and hybrid (i.e., diabolically degenerated exceptional) singularities of simple bosonic systems composed of up to five modes with damping and/or amplification are […]
Quantum 9, 1931 (2025). https://doi.org/10.22331/q-2025-12-05-1931 To achieve quantum fault tolerance with lower overhead, quantum low-density parity-check (QLDPC) codes have emerged as a promising alternative to topological codes such as the surface code, offering higher code […]
Quantum 9, 1930 (2025). https://doi.org/10.22331/q-2025-12-05-1930 Nonlocal tests on multi-partite quantum correlations form the basis of protocols that certify randomness in a device-independent (DI) way. Such correlations admit a rich structure, making the task of choosing […]
Quantum 9, 1929 (2025). https://doi.org/10.22331/q-2025-12-05-1929 Quantum resource theories provide a mathematically rigorous way of understanding the nature of various quantum resources. An important problem in any quantum resource theory is to determine how quantum states […]
Quantum 9, 1928 (2025). https://doi.org/10.22331/q-2025-12-03-1928 We explore the potential of levitating solids embedded with non-permanent, optically controllable electron spins, which can be used to hyperpolarize their nuclear spin environment with exceptionally long lifetimes. For example, […]
Quantum 9, 1927 (2025). https://doi.org/10.22331/q-2025-12-02-1927 Recent advances in quantum computing have brought us closer to realizing the potential of this transformative technology. While significant strides have been made in quantum error correction, many challenges persist, […]
Quantum 9, 1926 (2025). https://doi.org/10.22331/q-2025-12-02-1926 Implementations of Roetteler’s shifted bent function algorithm have in recent years been used to test and benchmark both classical simulation algorithms and quantum hardware. These circuits have many favorable properties, […]
Quantum 9, 1925 (2025). https://doi.org/10.22331/q-2025-12-02-1925 Universal gate sets for quantum computation, when single and two qubit operations are accessible, include both Hermitian and non-Hermitian gates. Here we utilize the fact that any single-qubit operator may […]
Quantum 9, 1924 (2025). https://doi.org/10.22331/q-2025-12-02-1924 Digital quantum simulation (DQS) is one of the most promising paths for achieving first useful real-world applications for quantum processors. Yet even assuming rapid progress in device engineering and development […]
Quantum 9, 1923 (2025). https://doi.org/10.22331/q-2025-12-02-1923 Over the past decade, a number of quantum processes have been proposed which are logically consistent, yet feature a cyclic causal structure. However, there is no general formal method to […]
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