Amazing stuff! If you got ants in your pants and you need to dance? 😊
"... The tiny diamonds, with an average width of 750 nanometers, are first produced under high pressure and temperature. Then, they’re irradiated with high-energy electrons to create what’s known as a nitrogen-vacancy defect, which can be used to hold quantum information.
To get the nanodiamonds levitating, the team created a surface ion trap by depositing a thin layer of gold onto a sapphire wafer, then etching the gold into an “omega” shape (Ω). When a current is pumped through the gold, it creates an electromagnetic field that can levitate a nanodiamond placed above the surface, in a vacuum chamber. ...
In doing so, the team managed to get the nanodiamonds spinning at speeds of up to 1.2 billion rpm. ... the same team currently holds that record with a nanoscale “dumbbell” that rotated at a blistering 300 billion rpm. ...
When the spinning diamonds are lit up with a green laser they emit red light of their own, which allows scientists to read out the spin states of the electrons inside their defects. At the same time, an infrared laser was shone on the diamonds and the pattern of how they scattered that light tells the team how they’re rotating. Comparing the two measurements allows scientists to infer how the diamonds’ spin affects the quantum information contained in their defects. ...
how gravity could be explained in quantum terms, which remains one of the most pressing problems in physics."
When the spinning diamonds are lit up with a green laser they emit red light of their own, which allows scientists to read out the spin states of the electrons inside their defects. At the same time, an infrared laser was shone on the diamonds and the pattern of how they scattered that light tells the team how they’re rotating. Comparing the two measurements allows scientists to infer how the diamonds’ spin affects the quantum information contained in their defects. ...
how gravity could be explained in quantum terms, which remains one of the most pressing problems in physics."
"... explore the mysterious relationship between quantum mechanics and gravity ..."
From the abstract:
"Levitated diamond particles in high vacuum with internal spin qubits have been proposed for exploring macroscopic quantum mechanics, quantum gravity, and precision measurements. The coupling between spins and particle rotation can be utilized to study quantum geometric phase, create gyroscopes and rotational matter-wave interferometers. However, previous efforts in levitated diamonds struggled with vacuum level or spin state readouts. To address these gaps, we fabricate an integrated surface ion trap with multiple stabilization electrodes. This facilitates on-chip levitation and, for the first time, optically detected magnetic resonance measurements of a nanodiamond levitated in high vacuum. The internal temperature of our levitated nanodiamond remains moderate at pressures below 10−5 Torr. We have driven a nanodiamond to rotate up to 20 MHz (1.2 × 109 rpm), surpassing typical nitrogen-vacancy (NV) center electron spin dephasing rates. Using these NV spins, we observe the effect of the Berry phase arising from particle rotation. In addition, we demonstrate quantum control of spins in a rotating nanodiamond. These results mark an important development in interfacing mechanical rotation with spin qubits, expanding our capacity to study quantum phenomena."
Purdue physicists throw world’s smallest disco party "A new milestone has been set for levitated optomechanics as Prof. Tongcang Li’s group observed the Berry phase of electron spins in nano-sized diamonds levitated in vacuum"
Quantum control and Berry phase of electron spins in rotating levitated diamonds in high vacuum (open access)
Fig. 1: Stable levitation of a nanodiamond in high vacuum.
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