Quantum 7, 1162 (2023). https://doi.org/10.22331/q-2023-11-03-1162 A unifying formalism of generalized conditional expectations (GCEs) for quantum mechanics has recently emerged, but its physical implications regarding the retrodiction of a quantum observable remain controversial. To address the […]
Quantum 7, 1161 (2023). https://doi.org/10.22331/q-2023-11-03-1161 Landauer’s principle gives a fundamental limit to the thermodynamic cost of erasing information. Its saturation requires a reversible isothermal process, and hence infinite time. We develop a finite-time version of […]
Quantum 7, 1160 (2023). https://doi.org/10.22331/q-2023-11-03-1160 The star-triangle relation plays an important role in the realm of exactly solvable models, offering exact results for classical two-dimensional statistical mechanical models. In this article, we construct integrable quantum […]
Quantum 7, 1159 (2023). https://doi.org/10.22331/q-2023-11-03-1159 Deriving quantum mechanics from information-theoretic postulates is a recent research direction taken, in part, with the view of finding a beyond-quantum theory; once the postulates are clear, we can consider […]
Quantum 7, 1158 (2023). https://doi.org/10.22331/q-2023-11-03-1158 Accurate modeling of decoherence errors in quantum processors is crucial for analyzing and improving gate fidelities. To increase the accuracy beyond that of the Lindblad dynamical map, several generalizations have […]
Quantum 7, 1157 (2023). https://doi.org/10.22331/q-2023-10-25-1157 When two particles interact primarily through gravity and follow the laws of quantum mechanics, the generation of entanglement is considered a hallmark of the quantum nature of the gravitational interaction. […]
Quantum 7, 1156 (2023). https://doi.org/10.22331/q-2023-10-25-1156 In this paper, I present a way to compile the surface code into two-body parity measurements (“pair measurements”), where the pair measurements run along the edges of a Cairo pentagonal […]
Quantum 7, 1155 (2023). https://doi.org/10.22331/q-2023-10-25-1155 We establish an efficient approximation algorithm for the partition functions of a class of quantum spin systems at low temperature, which can be viewed as stable quantum perturbations of classical […]
Quantum 7, 1154 (2023). https://doi.org/10.22331/q-2023-10-24-1154 We reduce the extra qubits needed for two fault-tolerant quantum computing protocols: error correction, specifically syndrome bit measurement, and cat state preparation. For distance-three fault-tolerant syndrome extraction, we show an […]
Quantum 7, 1153 (2023). https://doi.org/10.22331/q-2023-10-24-1153 The promise of high-rate low-density parity check (LDPC) codes to substantially reduce the overhead of fault-tolerant quantum computation depends on constructing efficient, fault-tolerant implementations of logical gates on such codes. […]
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