Quantum 10, 2149 (2026). https://doi.org/10.22331/q-2026-06-30-2149 Fault-tolerant quantum computers will depend crucially on the performance of the classical decoding algorithm which takes in the results of measurements and outputs corrections to the errors inferred to have […]
Quantum 10, 2148 (2026). https://doi.org/10.22331/q-2026-06-30-2148 The quantum Zeno effect is a fundamental mechanism for implementing the effective dynamics of projected Hamiltonian and Lindbladian systems. It approximates the target projected evolution by interleaving Hamiltonian or Lindblad […]
Quantum 10, 2147 (2026). https://doi.org/10.22331/q-2026-06-30-2147 There has been a surge of recent interest in the Wigner’s Friend paradox, sparking several novel thought experiments and no-go theorems. The main narrative has been that Wigner’s Friend highlights […]
Quantum 10, 2146 (2026). https://doi.org/10.22331/q-2026-06-30-2146 We present efficient and practical protocols to measure the second Rényi entropy, whose exponential is known as the purity. Our approach is based on expressing the purity in terms of […]
Quantum 10, 2145 (2026). https://doi.org/10.22331/q-2026-06-30-2145 Recent discoveries in asymptotically good quantum codes have intensified research on their application in quantum computation and fault-tolerant operations. This study focuses on the addressability problem within CSS codes: we […]
Quantum 10, 2144 (2026). https://doi.org/10.22331/q-2026-06-30-2144 We prove that any $n$-qubit unitary can be implemented (i) approximately in time $tilde Obig(2^{n/2}big)$ with query access to an appropriate classical oracle, and also (ii) exactly by a circuit […]
Quantum 10, 2143 (2026). https://doi.org/10.22331/q-2026-06-19-2143 Quantum reservoir engineering leverages dissipative processes to achieve desired behaviour, with applications ranging from entanglement generation to quantum error correction. Therein, a structured environment acts as an entropy sink for […]
Quantum 10, 2142 (2026). https://doi.org/10.22331/q-2026-06-19-2142 We construct an ontological model for the theory known as bilocal classical theory [1]. To our knowledge, this is only the second time that an ontological model has been constructed […]
Quantum 10, 2141 (2026). https://doi.org/10.22331/q-2026-06-19-2141 The problem of deciding whether a set of quantum measurements is jointly measurable is known to be equivalent to determining whether a quantum assemblage is unsteerable. This problem can be […]
Quantum 10, 2140 (2026). https://doi.org/10.22331/q-2026-06-15-2140 Phase estimation, due to Kitaev [17], is one of the most fundamental subroutines in quantum computing. In the basic scenario, one is given black-box access to a unitary $U$, and […]
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