Engineering powerful and scalable molecular qubits


Engineering powerful and scalable molecular qubits

By placing molecular qubits in an asymmetric crystal matrix, Professor David Oshalom and his team found that some quantum states were less sensitive to external magnetic fields. Credit: Awschalom Group, D. Laorenza / MIT

The concept of “symmetry” is central to fundamental physics: a critical component of everything from subatomic particles to macroscopic crystals. Accordingly, a lack of symmetry – or asymmetry – can greatly affect the properties of a particular system.

Qubits, the quantum analogue of quantum computers for quantum computers, are extremely sensitive — the slightest disturbance in a qubit system is enough to lose any Quantitative information Maybe she got pregnant. Given this fragility, it seems counterintuitive qubit It will be more stable in a symmetric environment. However, for a particular type of qubit – molecular qubits – the opposite is true.

Researchers from the University of Chicago’s Pritzker School of Molecular Engineering (PME), the University of Glasgow, and the Massachusetts Institute of Technology have found that molecular qubits are more stable in an asymmetric environment, expanding the possible applications of such qubits, especially as biological quantum sensors.

The work was published in August in X . physical review.

said David Awschalom, Liew Family Professor of Molecular Engineering and Physics at UChicago, chief scientist at Argonne, director of the Chicago Quantum Exchange, and director of Q-NEXT, the Department of Energy’s quantum information science center. “Developing its stabilization method opens new doors for potential applications of this emerging technology.”

Using a qqubit system requires that it have two quantum states that can match “0” and “1”, as in a classical computer. But quantum states are fragile, and will collapse if they are perturbed in any way. Quantum scientists have been pushing the limits of how long they can make a qubit stable quantum state Pre-breakdown, also known as “bonding time”.

Protecting qubits from as much external influence as possible is one way to try to increase their coherence time, and by placing molecular qubits in an asymmetric crystal matrix, Oshalom and his team found that some quantum states were less sensitive to external magnetic fields, and thus had longer coherence times: 10 s, compared to 2 s for identical qubits in a symmetric crystal group.

The asymmetric environment provides “coherence protection” that could allow qubits to retain their quantum information even if they are placed in more chaotic locations, says Dan Lorenza, a graduate student in chemistry at MIT who worked on the project.

“We now understand a straightforward and reliable mechanism for improving the coherence of molecular qubits in magnetically noisy environments,” he said. “Importantly, this asymmetric environment can be easily translated into many other molecular systems, especially for molecules placed in amorphous environments such as those found in biology.”

Qubit quantum sensors have a myriad of potential applications in biological systems, especially in medical contexts; But these systems are notorious for being unregulated and noisy, which makes keeping these qubit sensors together a very difficult challenge. Understanding why the asymmetric environment stabilizes molecular qubits against magnetic fields may improve sensors in these areas of research.


Full control of a six-qubit silicon quantum processor


more information:
SL Bayliss et al, Enhancement of spin coherence in optically addressable molecular qubits through host matrix control, X . physical review (2022). DOI: 10.1103/ PhysRevX.12.031028

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the quote: Engineering Strong and Scalable Molecular Qubits (2022, Sep 28) Retrieved on Sep 28, 2022 from https://phys.org/news/2022-09-robust-scalable-molecular-qubits.html

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