silicon quantum dots tagged posts

Study achieves the Coherent Manipulation of Electron Spins in Silicon

Study achieves the coherent manipulation of electron spins in silicon
Electrons in silicon experience a coupling between their spin (up and down arrows) and valley states (blue and red orbitals). In the presence of a DC voltage (blue glow) an electron can undergo coherent spin-valley oscillation. Image credit: Mike Osadciw.

In recent years, many physicists and computer scientists have been working on the development of quantum computing technologies. These technologies are based on qubits, the basic units of quantum information. In contrast with classical bits, which have a value of 0 or 1, qubits can exist in superposition states, so they can have a value of 0 and 1 simultaneously. Qubits can be made of different physical systems, including electrons, nuclear spins (i.e., the spin state of a nucleus), photons, and superconducting circuits.

Electron s...

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A CMOS-based chip that integrates silicon quantum dots and multiplexed readout electronics

Microscopy photo of chip with bond wires. Credit: Ruffino et al.

Researchers at École Polytechnique Fédérale de Lausanne (EPFL) and the Hitachi Cambridge Laboratory have recently designed an integrated circuit (IC) that integrates silicon quantum dots with conventional readout electronics. This chip, introduced in a paper published in Nature Electronics, is based on a 40-nm cryogenic complementary metal-oxide semiconductor (CMOS) technology that is readily and commercially available.

“Our recent paper builds on the expertise of the two groups involved,” Andrea Ruffino, one of the researchers at EPFL who carried out the study, told TechXplore...

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