Quantum 7, 1081 (2023). https://doi.org/10.22331/q-2023-08-10-1081 We consider the problem of approximating the ground state energy of a fermionic Hamiltonian using a Gaussian state. In sharp contrast to the dense case [1, 2], we prove that […]
Category: quantumjournal
Quantum 7, 1080 (2023). https://doi.org/10.22331/q-2023-08-10-1080 How to understand the set of correlations admissible in nature is one outstanding open problem in the core of the foundations of quantum theory. Here we take a complementary viewpoint […]
Quantum 7, 1079 (2023). https://doi.org/10.22331/q-2023-08-09-1079 The cryptographic task of position verification attempts to verify one party’s location in spacetime by exploiting constraints on quantum information and relativistic causality. A popular verification scheme known as $f$-routing […]
Quantum 7, 1078 (2023). https://doi.org/10.22331/q-2023-08-09-1078 Quantum computers hold great promise to enhance machine learning, but their current qubit counts restrict the realisation of this promise. To deal with this limitation the community has produced a […]
Quantum 7, 1077 (2023). https://doi.org/10.22331/q-2023-08-08-1077 Pauli spin blockade (PSB) can be employed as a great resource for spin qubit initialisation and readout even at elevated temperatures but it can be difficult to identify. We present […]
Quantum 7, 1076 (2023). https://doi.org/10.22331/q-2023-08-08-1076 Recently, Zhong et al. [1, 2] performed landmark Gaussian boson sampling experiments with up to 144 modes using threshold detectors. The authors claim to have achieved quantum computational advantage with […]
Quantum 7, 1075 (2023). https://doi.org/10.22331/q-2023-08-08-1075 The Shor fault-tolerant error correction (FTEC) scheme uses transversal gates and ancilla qubits prepared in the cat state in syndrome extraction circuits to prevent propagation of errors caused by gate […]
Quantum 7, 1074 (2023). https://doi.org/10.22331/q-2023-08-03-1074 While the terms “redundancy” and “consensus” are often used as synonyms in the context of quantum objectivity, we show here that these should be understood as two related but distinct […]
Quantum 7, 1073 (2023). https://doi.org/10.22331/q-2023-08-03-1073 Science is rich in abstract concepts that capture complex processes in astonishingly simple ways. A prominent example is the reduction of molecules to simple graphs. This work introduces a design […]
Quantum 7, 1072 (2023). https://doi.org/10.22331/q-2023-08-03-1072 Quantum computing is a promising way to systematically solve the longstanding computational problem, the ground state of a many-body fermion system. Many efforts have been made to realise certain forms […]
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