![]() ![]() In some way, the torque induced by the small disturbances will be averaged out by the rotation of the top. However, when the top is spinning, the same disturbance will only have a small impact around the axis of rotation. Any small disturbance (like noise coming from the environment we discussed above) will tip it over. The reason is that, although a top standing on its tip is in equilibrium, this equilibrium is unstable. If the top is at rest, it will immediately fall on one side. Consider a spinning top, like the one used by little children (and most of their fathers…). Let’s try to explain this discovery with a simple (probably too simple) analogy. Advanced readers may recall that this is not too different from the idea of a topological quantum computer where the qubits are rather exotic (and not yet fully certain) particles called anyons, which do not interact with the external world. ![]() The almost impossible has become possible. So, we now have a new qubit that is protected from the rest of the world, but can still be made to interact with other similar qubits. This object lives in a Decoherence Protected Subspace (DPS), where interactions with the external world are somehow averaged out. Adding an exquisitely tailored oscillating magnetic field to drive the qubit transforms it into a new object, known as a dressed-state, which corresponds to a mixture of the qubit with the magnetic field. Check out this Quantum Hermit article for a good explanation. Scientists are torn between two competing demands: keep the qubits as well isolated as possible make them interact with other qubits to perform computations.Īs reported in the Science Magazine article, the recent work by David Awshalom and his team, mostly at the University of Chicago, demonstrates a new and potentially generic way to improve the coherence time of qubits, possibly by up to four orders of magnitude. The physics of this phenomenon is quite involved, but the principle behind it is rather simple. This is why quantum computers have to be kept isolated from any external influence and, for most types of qubits, at a very low temperature. Even a very weak interaction between a qubit and its environment can make it lose its properties a situation that is even worse when dealing with a larger ensemble of qubits. The main hurdle, which is only partially addressed today, is called decoherence. We can now create qubits, store them (albeit for a short time) and make them interact to perform quantum computations. Thanks to significant investment over the last decade by companies and governments alike, we are learning to play with qubits, the fundamental unit of information in the quantum world. We also acknowledge its impact on quantum computing, communication and sensing applications.īy harnessing the peculiar properties of matter at the smallest scale, quantum technologies are poised to revolutionise the way we process and utilise information. In this blog, we look at the work of a research team from the Pritzker School of Molecular Engineering at the University of Chicago, which recently announced they have identified a simple method to maintain qubit coherence 10,000 times longer than before. New Breakthrough in Quantum Technologies: how to improve coherence time of a qubit by a factor of 10,000 Enabling Quantum Technologies Through Photonic Sensing Solutions –Ī quantum breakthrough for qubit coherence.ID230 Infrared Single-Photon Detector –.InGaAs/InP Single-Photon Avalanche Diodes.ID281 Superconducting Nanowire Series –.Superconducting Nanowire Single Photon Detectors –.2022 Photonic Sensing Research Digest –.Parallel-pixel SNSPDs for Ultrafast and Photon- Number-Resolved Detection –.Enabling Quantum Technologies through Photonic Sensing Solutions. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |