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Tomography of Entangled Macroscopic Mechanical Objects | | Shlomi Kotler
; Gabriel A. Peterson
; Ezad Shojaee
; Florent Lecocq
; Katarina Cicak
; Alex Kwiatkowski
; Shawn Geller
; Scott Glancy
; Emanuel Knill
; Raymond W. Simmonds
; José Aumentado
; John D. Teufel
; | | Date: |
12 Apr 2020 | | Abstract: | Observing quantum mechanics at the macroscopic scale has captured the
attention of scientists and the imagination of the public for more than a
century. While quantum mechanics was conceived in the context of electrons and
atoms, the ability to observe its properties on ever more macroscopic systems
holds great promise for fundamental research and technological applications.
Therefore, researchers have been preparing larger material systems in
interesting quantum states and, in particular, entangled states of separate
mechanical oscillators[1-3]. As these quantum devices move from demonstrations
to applications, their full potential can only be realized by combining
entanglement generation with an efficient measurement of the joint mechanical
state. Unfortunately, such a high level of control and measurement can expose
the system to undesired interactions with its environment, a problem that
becomes more pronounced at the macroscopic scale. Here, using a superconducting
electromechanical circuit and a pulsed microwave protocol, we ground-state
cool, entangle and perform state tomography of two mechanical drumheads with
masses of 70 pg. Entanglement is generated deterministically and is followed by
a nearly quantum-limited measurement of the positions and momentums of both
mechanical oscillators. From these efficient measurements, the resulting
tomography demonstrates entanglement without noise subtraction. Highly
entangled, massive quantum systems, as demonstrated here, are uniquely poised
to address fundamental tests of quantum mechanics[4,5], enable force sensing
beyond the standard quantum limit[6], and possibly serve as long-lived nodes of
a future quantum network[7,8]. | | Source: | arXiv, 2004.5515 | | Services: | Forum | Review | PDF | Favorites | |
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