SQL??????????????????

1
SQL??????????????????

• ????? (???)
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2
??

• ????????Q??????????????? SQL????????????????
• ??
• 1. ?????????SQL??????
• 2. ????Q?
• 3. SQL??????
• 4. ???

3
??????(Standard Quantum Limit)

• ??????? ?????????????????????????
• ?????(Radiation Pressure Noise)
  ????????????????????
• ????(Shot Noise) ????????
• 2????????????????????????????????? ???????

???????????
4
??????????????????

• ?????????????SQL??????????????????
• ??????SQL???????????????(MEMS??)????????????????
• ???????????????
  High-Q???????SQL??????????
• ????????????High-Q???
• ?????????SQL???????????

5
???? _at_LKB
Phys. Rev Lett, 97,133601 (2006)

• ?????
• Si?????????????????????

6
???? _at_ Helsinki TKK
Appl. Phys. B. 88, 417(2007)

• ????
• ??????????
• ??????????????????

7
???? _at_Max Planck Institut

• Toroidal microcavity
• Fiber???????????????????????
• ????

Phys. Rev. Lett 97, 243905 (2006)
8
???? _at_ Boston univ.

• ??????????????????????????????????
• ?????40mK??????????????
• ????????????(????)????

Appl. Phys. Lett. 91, 203503 (2007)
9
SQL??????????(???)

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10
????????

• Citizen FineTech??
• ???????????????????????
• ??
• m0.6mg
• f 32kHz (215Hz)
• ????? ??????????????????????Q???????

3.6mm
11
Q???

• ??????????????stage????
• ???????????????(32400Hz??)
• ???????????????(He-Ne, lt1mW)
• ????????????Lock-in Amp.??????
• ?????Q6000-10000??

12
Q???????

• 5.8K????
• ???????????
• Qmax5106 (t50s)
• gram scale?????????? (?????) ????
• 20-50K???? Qmax??????????????

Na?????????? "Noise in Physical Systems and
1/f Noise", 1986, 323
13
????????

• ?????????????
• ???????(lt1Pa)???????????????
• ???????????????????
• Q?????????????

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14
SQL??????

• ????????????SQL????????
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• ???????Q???????????????????????

15
Michelson Interferometer(1)

• Structure damping model
• Measuring noise
• BS??????????????

mechanical susceptibility
16
?????SQL

• ??? Structure Damping
• ?????Michelson??????SQL?

• ?????????????????????????????

7?????
17
Off resonance??SQL

• ????????????
• ?????105W
• ????????(1W?F2000?)
• ?????????????????
• Free mass ?SQL????????

?????????? 200kHz??
18
????SQL noise

• ????????????????????3????????
• 80kHz???????????????

19
?????????????

• ????10-19 m/rHz????????
• ???????????????????????????????????
  ?
• ????????????????????????????
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20
????????

• ?????(0.6mg)??????????
• ???????????????????
• High-Q?????????????????????????????????????

m1µg(1?????? ???????)
(Q500?)
21
???

• ?????????SQL??????????????????????????????????
• ????Q?????500?????????????????????????
• ????????(32kHz)???????(80kHz)???????SQL???????????
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• ????????????????????????????????????????????????