Name: Error-protected quantum bits entangled for the first time
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Error-protected quantum bits entangled for the first time

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January 13, 2021byFor the first time, physicists from the University of Innsbruck have entangled two quantum bits distributed over several quantum objects and successfully transmitted their quantum properties. This marks an important milestone in the development of fault-tolerant quantum computers. The researchers published their report in Nature.Even computers can miscalculate; small disturbances change stored information and corrupt results. So computers use methods to continuously correct such errors. In quantum computers, the vulnerability to errors can be reduced by storing in more than a single quantum particle. These logical quantum bits are less sensitive to errors. In recent years, theorists have developed many different error correction codes and optimized them for different tasks."The most promising codes in are those defined on a two-dimensional lattice," explains Thomas Monz from the Department of Experimental Physics at the University of Innsbruck. "This is due to the fact that the physical structure of current quantum computers can be very well mapped through such lattices." With the help of the codes, logical quantum bits can be distributed over several . The quantum physicists from Innsbruck have now succeeded for the first time in entangling two quantum bits coded in this way. The entanglement of two quantum bits is an important resource of quantum computers, giving them a performance advantage over classical computers.A kind of quantum sewing machineFor their experiment, the physicists use an ion-trap quantum with ten ions. Into these ions the logical are encoded. Using a technique that scientists refer to as 'lattice surgery,' two logical qubits encoded on a lattice can be 'stitched together.'"A new, larger is created from the qubits stitched together in this way," explains Alexander Erhard from the Innsbruck team. In turn, a large logical qubit can be separated into two individual logical qubits by lattice surgery. In contrast to the standard operations between two logical qubits, lattice surgery only requires operations along the boundary of the encoded qubits, not on their entire surface. "This reduces the number of operations required to create entanglement between two encoded qubits," explain the theoretical physicists Nicolai Friis and Hendrik Poulsen Nautrup.Key technology for fault tolerant quantum computersLattice surgery is considered one of the key techniques for the operation of future fault-tolerant quantum computers. Using lattice surgery, the physicists led by Thomas Monz and Rainer Blatt, together with the theoretical physicists Hendrik Poulsen Nautrup and Hans Briegel from the Department of Theoretical Physics at the University of Innsbruck and Nicolai Friis from the Institute of Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences in Vienna, have now demonstrated the generation of entanglement between two encoded qubits. This is the first experimental realization of non-classical correlations between topologically encoded qubits. Furthermore, the researchers were able to demonstrate for the first time the teleportation of quantum states between two encoded qubits.Explore furtherMore information:Entangling logical qubits with lattice surgery, Nature (2021).Journal information:Provided byCitation:Error-protected quantum bits entangled for the first time (2021, January 13)retrieved 13 January 2021from https://phys.org/news/2021-01-error-protected-quantum-bits-entangled.htmlThis document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, nopart may be reproduced without the written permission. The content is provided for information purposes only.9 hours ago9 hours ago9 hours ago10 hours agoJan 12, 202113 hours agoJan 12, 2021Jan 12, 2021Jan 10, 2021Jan 08, 2021Jan 08, 2021More fromWhat do you think about this particular story?Your feedback will go directly to Science X editors.E-mail the storyError-protected quantum bits entangled for the first timeThis site uses cookies to assist with navigation, analyse your use of our services, and provide content from third parties.By using our site, you acknowledge that you have read and understand ourand .

January 13, 2021byFor the first time, physicists from the University of Innsbruck have entangled two quantum bits distributed over several quantum objects and successfully transmitted their quantum properties. This marks an important milestone in the development of fault-tolerant quantum computers. The researchers published their report in Nature.Even computers can miscalculate; small disturbances change stored information and corrupt results. So computers use methods to continuously correct such errors. In quantum computers, the vulnerability to errors can be reduced by storing in more...

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Error-protected quantum bits entangled for the first time

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