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<p class="MsoNormal" align="center" style="margin-bottom:0in;text-align:center"><b><span style="font-size: 18pt; line-height: 107%; font-family: "Times New Roman", serif; color: rgb(0, 111, 192);" class="ContentPasted0">Astronomy Seminar</span></b><b><span style="font-size: 28pt; line-height: 107%; font-family: "Times New Roman", serif; color: rgb(0, 111, 192);"><br class="ContentPasted0">
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<p class="MsoNormal" align="center" style="margin-bottom:0in;text-align:center"><i><span style="font-size: 20pt; line-height: 107%; font-family: "Adobe Devanagari", serif; background: white; color: rgb(36, 36, 36);" class="ContentPasted0">Expanding Our Gravitational
View of the Universe With Quantum Interferometry</span></i><b><i><span style="font-size:24.0pt;line-height:107%;font-family:"Times New Roman",serif"><o:p class="ContentPasted0"></o:p></span></i></b></p>
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<p class="MsoNormal" align="center" style="margin-bottom:0in;text-align:center"><b><i><span style="font-size:22.0pt;line-height:107%;font-family:Algerian;mso-bidi-font-family:Arial" class="ContentPasted0">Dr. Victoria Xu</span></i></b><b><i><span style="font-size:24.0pt;line-height:107%;font-family:"Times New Roman",serif"><o:p class="ContentPasted0"></o:p></span></i></b></p>
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<p class="MsoNormal" align="center" style="margin-bottom:0in;text-align:center"><i><span style="font-size:16.0pt;line-height:107%;font-family:"Times New Roman",serif" class="ContentPasted0">Massachusetts Institute of Technology<o:p class="ContentPasted0"></o:p></span></i></p>
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<p class="MsoNormal"><b><span style="font-size: 12pt; line-height: normal; font-family: "Times New Roman", serif; background: white; color: black;" class="ContentPasted0">Abstract:
</span></b><span style="font-size: 12pt; line-height: normal; font-family: "Segoe UI", sans-serif; background: white; color: rgb(36, 36, 36);" class="ContentPasted0">From atom interferometry to laser interferometry, experiments are leveraging quantum mechanics
to expand our gravitational view of the Universe. In atom interferometry, we have realized ultra-long coherence times for cold atoms trapped in spatially-separated macroscopic superpositions. Such trapped interferometers are uniquely suited to precision table-top
tests of exotic physics and gravity. In laser interferometry, the Laser Interferometer Gravitational-wave Observatory (LIGO) operates at the limit of quantum noise to detect gravitational waves (GWs) from cataclysmic cosmic events, such as the mergers of black
hole and neutron star binaries. While the detectors already inject quantum light (“squeezed” vacuum) to reduce high-frequency quantum shot noise, this quantum enhancement comes at the cost of added low-frequency quantum noise due to opto-mechanical backaction.
We have now commissioned major infrastructure to mitigate quantum backaction across the astrophysically-critical band. With the filter cavity upgrade to frequency-dependent squeezing in LIGO, we realize broadband quantum enhancement for GW detection, demonstrating
a new fundamental and necessary technology for our observatories. In the upcoming observing run of LIGO, our quantum-enhanced sensitivity will expand our astrophysical horizons by 60%, expected to bring event rates from a near-weekly to near-daily just nine
years after the dawn of GW astronomy. This is just the beginning of what quantum engineering can offer for precision interferometry and fundamental physics, with applications ranging from studies of gravity and coherence in massive quantum systems, to expanding
the quantum-limited horizons of gravitational-wave astronomy.</span><o:p class="ContentPasted0"></o:p></p>
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<p class="MsoNormal" align="center" style="margin-bottom:0in;text-align:center"><b><span style="font-size: 12pt; font-family: "Times New Roman", serif; color: rgb(47, 84, 150);" class="ContentPasted0">Wednesday, April 5th, 2023</span></b><b><i><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p class="ContentPasted0"></o:p></span></i></b></p>
<p class="Default" align="center" style="text-align:center"><b><span style="color: rgb(47, 84, 150);" class="ContentPasted0">2:00 p.m. in the Physics Reading Room (3035)</span></b><span style="color: rgb(47, 84, 150);"><o:p class="ContentPasted0"></o:p></span></p>
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