New Josephson junction study links quantum theory to experiment | 10/9/2018 | Staff
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The Josephson junction is one of the most important elements in turning quantum phenomena into usable technology.

A new RMIT study establishes a theoretical framework for new optical experimentation on these key devices, with implications for future fundamental quantum research and applications such as quantum computing.

Josephson - Junctions - Plates - Insulating - Layer

Josephson junctions can be formed by two superconducting plates, separated by a very-thin insulating layer, with electronic charge traveling from one plate to the other via quantum tunnelling, and is an important bridge between quantum mechanics at the micro-scale and practical technologies at the macroscale.

Applications include existing devices such as magnetic field detectors (called SQUIDs), and emerging technologies such as quantum computers.

Josephson - Junctions - Interest - Perspective - Realizations

Josephson junctions are also of interest from a fundamental perspective, used as physical realizations of theoretical models to study phase transitions and topological excitations.

The fabrication technology for these systems is now sufficiently advanced that the parameters governing the physics of interest can be fine-tuned with a high degree of precision.

Studies - Josephson - Junction - Devices - Date

Studies of Josephson junction devices to date have typically focused on electronic transport measurements: experimenters attach metallic leads to the device, apply a voltage, and measure the resulting output current.

However, the presence of those electrical connections inevitably introduces an additional source of noise, which destroys many of the quantum effects the experimenters wish to study.

Charge - Noise - Interaction - Quantum - Device

Mitigating this charge noise, and minimizing the interaction between the quantum device and the noisy outside world, are major challenges to the development of practical quantum technologies.

Recent experiments (Hiroshi Nakamura, Riken, Japan) have circumvented the problem of noisy leads by putting their device in a 3-D cavity where...
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