Laser-cooled atomic gases, gases of atoms chilled to temperatures around absolute zero using laser technologies, have proved to be versatile physical platforms to study and control quantum phenomena. When these atomic gases interact with light […]
Quantum 9, 1731 (2025). https://doi.org/10.22331/q-2025-05-05-1731 Building on the insight that engineered noise, specifically, engineered dephasing can enhance the adiabaticity of controlled quantum dynamics, we investigate how a dephasing-generating coupling to an auxiliary quantum system affects […]
Quantum 9, 1730 (2025). https://doi.org/10.22331/q-2025-05-05-1730 For random quantum circuits on $n$ qubits of depth $Theta(log n)$ with depolarizing noise, the task of sampling from the output state can be efficiently performed classically using a Pauli […]
Quantum 9, 1729 (2025). https://doi.org/10.22331/q-2025-05-05-1729 Non-Hermitian dynamics in quantum systems preserves the rank of the state density operator. Using this insight, we develop a geometric framework to describe its time evolution. In particular, we identify […]
Insider Brief: Qoro Quantum and CESGA executed a pilot integrating Qoro’s orchestration software with CESGA’s CUNQA emulator, demonstrating scalable, distributed quantum circuit simulations across 10 HPC nodes. The project tested distributed implementations of VQE and […]
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 […]
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