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. […]
Quantum 7, 1152 (2023). https://doi.org/10.22331/q-2023-10-24-1152 We introduce a semidefinite programming algorithm to find the minimal quantum Fisher information compatible with an arbitrary dataset of mean values. This certification task allows one to quantify the resource […]
Quantum 7, 1151 (2023). https://doi.org/10.22331/q-2023-10-24-1151 Spiking neural network is a kind of neuromorphic computing that is believed to improve the level of intelligence and provide advantages for quantum computing. In this work, we address this […]
Quantum 7, 1150 (2023). https://doi.org/10.22331/q-2023-10-24-1150 Bell’s theorem states that Local Hidden Variables (LHVs) cannot fully explain the statistics of measurements on some entangled quantum states. It is natural to ask how much supplementary classical communication […]
Quantum 7, 1149 (2023). https://doi.org/10.22331/q-2023-10-24-1149 We analyze the amount of classical communication required to reproduce the statistics of local projective measurements on a general pair of entangled qubits, $|Psi_{AB}rangle=sqrt{p} |00rangle+sqrt{1-p} |11rangle$ (with $1/2leq p leq […]
The brain is an exceptionally powerful computing machine. Scientists have long tried to recreate its inner workings in mechanical minds. A team from IBM may have cracked the code with NorthPole, a fully digital chip […]
Quantum 7, 1148 (2023). https://doi.org/10.22331/q-2023-10-23-1148 Quantum-enhanced computing methods are promising candidates to solve currently intractable problems. We consider here a variational quantum eigensolver (VQE), that delegates costly state preparations and measurements to quantum hardware, while […]
Quantum 7, 1147 (2023). https://doi.org/10.22331/q-2023-10-23-1147 Circuit cutting, the decomposition of a quantum circuit into independent partitions, has become a promising avenue towards experiments with larger quantum circuits in the noisy-intermediate scale quantum (NISQ) era. While […]
In June, an IBM computing executive claimed quantum computers were entering the “utility” phase, in which high-tech experimental devices become useful. In September, Australia’s chief scientist Cathy Foley went so far as to declare “the […]
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