A macroscopic device for quantum computation

Diederik Aerts, Ellie D’Hondt, Bart D’Hooghe +3 more

J. R. Clarke

Junyong Lee, Jeihee Cho, Hyeonseong Jung +4 more

In this paper, we investigate how quantum computers can be effectively utilized as physical computational units, specifically within the limitations of Noisy Intermediate-Scale Quantum (NISQ) devices. A central question we address is: How can we effectively emulate macroscopic quantum dynamics within the constraints of NISQ devices to fully realize the computational advantages of quantum computing? To tackle this, we explore the design of a macroscopic physical model, using a particle beam model as a case study. By employing a data-centric approach to energy encoding, we aim to optimize quantum states and extract the Hamiltonian, facilitating the accurate simulation of complex physical systems. Our work demonstrates the potential of NISQ devices in advancing macroscopic physical simulations, despite their inherent noise and limited qubit numbers, offering a promising path toward achieving Quantum advantage.

Yang Yu

Electrons in a superconductor form Cooper pairs and thus condense into a ground state which can be described by a macroscopic quantum wavefunction. The phase of the wavefunction represents a collective movement of millions of Cooper pairs. Using devices based on Josephson tunnel junctions we are able to control and detect the phase and number of Cooper pairs in a superconductor. Josephson devices are therefore excellent systems for demonstrating macroscopic quantum phenomena. We present a short review of the macroscopic quantum phenomena in superconducting Josephson devices, as well as their applications and prospects in quantum computationl.

J. Q. You

Yonuk Chong

The Nobel laureates of this year have devised an experiment to observe macroscopic quantum tunneling in an electrical circuit made of superconductors. This monumental discovery has sparked numerous innovations and ultimately earned the three pioneers the Nobel prize. Afterwards, superconducting circuits play a key role in the proliferation of quantum technology in the 21st century. Especially, in the heart of the 2nd quantum revolution, quantum information technology is based on the radical development of the quantum computers. Superconducting Josephson junction devices has been the most advanced technology that has been picked up by the global tech giants in quantum computing. I will briefly review how the superconducting quantum chips and the macroscopic quantum effect had led innovation in quantum technology afterwards.