Quantum 6, 707 (2022). https://doi.org/10.22331/q-2022-05-09-707 The quantum volume test is a full-system benchmark for quantum computers that is sensitive to qubit number, fidelity, connectivity, and other quantities believed to be important in building useful devices. […]
The digital world—your laptop, the internet it’s connected to, and the companies that make it all go—sits on a foundation of bits. These bits are the language digital computers speak. Bits come in two flavors: […]
Quantum 6, 706 (2022). https://doi.org/10.22331/q-2022-05-03-706 Classical simulators play a major role in the development and benchmark of quantum algorithms and practically any software framework for quantum computation provides the option of running the algorithms on […]
Quantum 6, 705 (2022). https://doi.org/10.22331/q-2022-05-03-705 There exist severe limitations on the accuracy of low-temperature thermometry, which poses a major challenge for future quantum-technological applications. Low-temperature sensitivity might be manipulated by tailoring the interactions between probe […]
Today’s computers guzzle large amounts of electricity, raising concerns about the climate impact of technology. A breakthrough in superconducting electronics could reduce the power bill significantly, while also making computers far faster. The phenomenon of […]
Quantum 6, 704 (2022). https://doi.org/10.22331/q-2022-05-02-704 Entanglement is an indispensable quantum resource for quantum information technology. In continuous-variable quantum optics, photon subtraction can increase the entanglement between Gaussian states of light, but for mixed states the […]
Quantum 6, 703 (2022). https://doi.org/10.22331/q-2022-05-02-703 Simulating molecules using the Variational Quantum Eigensolver method is one of the promising applications for NISQ-era quantum computers. Designing an efficient ansatz to represent the electronic wave function is crucial […]
Quantum 6, 702 (2022). https://doi.org/10.22331/q-2022-04-27-702 Topological phases are characterized by their entanglement properties, which is manifest in a direct relation between entanglement spectra and edge states discovered by Li and Haldane. We propose to leverage […]
Quantum 6, 701 (2022). https://doi.org/10.22331/q-2022-04-27-701 The average entanglement entropy (EE) of the energy eigenstates in non-vanishing partitions has been recently proposed as a diagnostic of integrability in quantum many-body systems. For it to be a […]
Quantum 6, 700 (2022). https://doi.org/10.22331/q-2022-04-27-700 We carefully examine critical metrology and present an improved critical quantum metrology protocol which relies on quenching a system exhibiting a superradiant quantum phase transition beyond its critical point. We […]
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