Quantum 9, 1728 (2025). https://doi.org/10.22331/q-2025-05-05-1728 Constant-rate low-density parity-check (LDPC) codes are promising candidates for constructing efficient fault-tolerant quantum memories. However, if physical gates are subject to geometric-locality constraints, it becomes challenging to realize these codes. […]
Insider Brief: Xanadu and Applied Materials are co-developing the first 300 mm high-volume-compatible fabrication process for superconducting transition edge sensors. The partnership is intended to support scalable, utility-scale quantum computing by enabling mass manufacturing of […]
Quantum 9, 1727 (2025). https://doi.org/10.22331/q-2025-05-05-1727 Error mitigation will play an important role in practical applications of near-term noisy quantum computers. Current error mitigation methods typically concentrate on correction quality at the expense of frugality (as […]
Quantum 9, 1726 (2025). https://doi.org/10.22331/q-2025-05-05-1726 We present an iterative generalisation of the quantum subspace expansion algorithm used with a Krylov basis. The iterative construction connects a sequence of subspaces via their lowest energy states. Diagonalising […]
Quantum 9, 1725 (2025). https://doi.org/10.22331/q-2025-05-05-1725 We study the estimation of relative entropy $D(rho|sigma)$ when $sigma$ is known. We show that the Cramér-Rao type bound equals the relative varentropy. Our estimator attains the Cramér-Rao type bound […]
Quantum 9, 1724 (2025). https://doi.org/10.22331/q-2025-05-05-1724 Current noisy quantum computers have multiple types of errors, which can occur in the state preparation, measurement/readout, and gate operation, as well as intrinsic decoherence and relaxation. Partly motivated by […]
Quantum 9, 1723 (2025). https://doi.org/10.22331/q-2025-05-05-1723 In this work, we introduce a method to construct fault-tolerant $textit{measurement-based quantum computation}$ (MBQC) architectures and numerically estimate their performance over various types of networks. A possible application of such […]
“The Superposition Guy’s Podcast”, hosted by Yuval Boger, Chief Commercial Officer at QuEra Computing Maud Vinet, CEO and co-founder of Quobly. We discuss the company’s mission to build large-scale quantum computers based on silicon qubits. […]
Insider Brief A new study warns that restrictive quantum technology policies are entrenching global inequality by excluding the Global South from access to emerging quantum innovations. Export controls by the U.S., EU and China are […]
Heriot-Watt University has officially opened a £2.5 million ($3.3 million USD) Optical Ground Station (HOGS) at its Research Park in Edinburgh to advance satellite-based quantum-secure communication. Developed under the UK Quantum Communications Hub and featuring […]
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