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A digital archive containing , pages of conference proceedings; reports of international women's organizations; publications of women's non-governmental organizations; and letters, diaries, and memoirs of women active internationally since the mid-nineteenth century. Powered by Springshare. Login to LibApps. When a PT transformation is applied to a quantum system it appears the same as the original.
Physicists are always on the look-out for signs of PT-violation, however, because this would indicate the presence of new physics. They would also like to be able to break the symmetry of quantum systems, like those containing single spins. This would allow them to control these systems — something that should be important for understanding quantum interactions and developing novel devices such as quantum simulators and quantum sensors based on these interactions.
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These defects occur when two neighbouring carbon atoms in diamond are replaced by a nitrogen atom with an extra electron and an empty lattice site. The electron is a single-spin system that is governed by a general non-Hermitian PT symmetric Hamiltonian and the researchers can manipulate the system by changing the electron spin state. In quantum mechanics, a Hamiltonian is an operator describing the energy of a system.
The PT symmetry and Hermitian are two mathematical terms describing the properties of Hamiltonians. In their work, Rong and colleagues applied a magnetic field to the axis of the NV centre.
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They then applied oscillating microwave pulses to it, so that they could finely control the NV centre and change the P and T direction of the system, causing it to break. While researchers have experimentally investigated the concepts of PT symmetry in various classical systems, one of the most anticipated breakthroughs in this field is to observe PT symmetry breaking in non-classical quantum systems.
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