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Nanomechanically Amplified Weak Electric Signals to Create Better MRI Scanners

By MedImaging International staff writers
Posted on 20 Feb 2012
Image: JQI researchers think they have discovered a way to amplify faint electrical signals using the motion of a nanomechanical membrane. If shown in experiments, the scheme could prove a boon to magnetic resonance imaging and quantum information science. This schematic of the proposed device shows its use in detecting--in this example--a signal produced by the quantum-mechanical "spin" of a group of atoms. The atoms generate a faint radiofrequency signal in a coil (L) which is connected to microscale wires that form an electrical capacitor. This vibrates the “nanomembrane,” which in turn affects the resonant frequency of a laser optical cavity. The output is light at frequency that is the sum of the original laser frequency plus the signal from the atoms (Photo courtesy of Taylor/NIST).
Image: JQI researchers think they have discovered a way to amplify faint electrical signals using the motion of a nanomechanical membrane. If shown in experiments, the scheme could prove a boon to magnetic resonance imaging and quantum information science. This schematic of the proposed device shows its use in detecting--in this example--a signal produced by the quantum-mechanical "spin" of a group of atoms. The atoms generate a faint radiofrequency signal in a coil (L) which is connected to microscale wires that form an electrical capacitor. This vibrates the “nanomembrane,” which in turn affects the resonant frequency of a laser optical cavity. The output is light at frequency that is the sum of the original laser frequency plus the signal from the atoms (Photo courtesy of Taylor/NIST).
A team of international physicists has developed a hypothesis on how to both detect weak electrical signals and cool electrical circuits using light and something very similar to a nanosized loudspeaker. If validated through research, the project could have an impact on detection of low-power radio signals, magnetic resonance imaging (MRI), and the developing field of quantum data science.

JQI is pursuing that goal through the work of leading quantum scientists from the department of physics of the University of Maryland (UMD; College Park, USA), the US National Institute of Standards and Technology (NIST; Gaithersburg, MD, USA) and the Laboratory for Physical Sciences (LPS) at UMD. Each institution brings to JQI major experimental and theoretic research programs that are focused the goals of controlling and exploiting quantum systems.

The team was composed of investigators from the Joint Quantum Institute (JQI; Copenhagen, Denmark), Neils Bohr Institute (Copenhagen, Denmark), and Harvard University (Cambridge, MA, USA). JQI researchers believe they have discovered a way to amplify faint electrical signals using the motion of a nanomechanical membrane, or loudspeaker. If shown in experiments, the scheme could prove a boon to magnetic resonance imaging and quantum information science.

“We envision coupling a nanomechanical membrane to an electrical circuit so that an electrical signal, even if exceedingly faint, will cause the membrane to quiver slightly as a function of the strength of that signal,” said JQI physicist Dr. Jake Taylor. “We can then bounce photons from a laser off that membrane and read the signal by measuring the modulation of the reflected light as it is shifted by the motion of the membrane. This leads to a change in the wavelength of the light.”

Current technology for measuring the wavelength of light is very sensitive, which makes it suitable for detecting the nanoscopic motions of the loudspeaker caused by extremely faint electrical signals. Moreover, the ability to detect extremely faint electrical signals may make MRI medical procedures much easier in the future. “MRI machines are so big because they are stuffed with really powerful superconducting magnets, but if we can reduce the strength of the signals we need for a reading, we can reduce the strength, and the size, of the magnets,” Prof. Taylor stated. “This may mean that one could get an MRI while sitting quietly in a room and forgo the tube.”

The same arrangement could be used to generate data-carrying photons from one qubit to another, according to Prof. Taylor. One prevalent quantum information-system design utilizes light to transfer data among qubits, entangled particles that will exploit the inherent strangness of quantum phenomena to perform specific calculations impossible for current computers. The “nanospeaker” could be used to translate low-energy signals from a quantum processor to optical photons, where they can be detected and transmitted from one qubit to another.

According to their calculations, converting the mechanical motion of the little loudspeaker into photons will siphon a considerable amount of heat out of the system (from room temperature to 3 K), which in turn will reduce noise in the system and provide for better signal detection.

The researchers published their findings in the journal December 27, 2011, in the journal Physical Review Letters.

Related Links:

Joint Quantum Institute
Neils Bohr Institute
US National Institute of Standards and Technology


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87 (52.928924560547): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (35.04753112793): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (36.954879760742): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (55.074691772461): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
105 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
106 (53.882598876953): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.014785766602): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (108.95729064941): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
109 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
110 (46.014785766602): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (475.88348388672): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (752.92587280273): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (605.10635375977): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (164.98565673828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
115 (63.180923461914): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
116 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
117 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
118 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
119 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
120 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
121 (!!!!! 5631.2084197998): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
122 (420.80879211426): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 51939.010620117): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (618.93463134766): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294739349 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739349 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 9109.9739074707): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (108.00361633301): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (434.87548828125): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (57.93571472168): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (339.98489379883): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (50.067901611328): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (222.92137145996): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (34.093856811523): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (182.8670501709): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (30.994415283203): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (593.18542480469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (478.02925109863): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (267.98248291016): SELECT name FROM jos_deeppockets WHERE id=212
138 (46.014785766602): SELECT name FROM jos_deeppockets WHERE id=212
139 (779.86717224121): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (670.9098815918): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (99.897384643555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
142 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
143 (!!!!! 9745.1210021973): TRUNCATE TABLE jos_trademed_module
144 (149.01161193848): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (79.870223999023): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294739349 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (856.87637329102): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
149 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
150 (!!!!! 1395.9407806396): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (110.14938354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
152 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
153 (61.988830566406): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294739349 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294739349 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (43.869018554688): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (39.815902709961): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (46.968460083008): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (159.97886657715): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
158 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294739349 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294739349 AND published='1' LIMIT 1
159 (86.069107055664): select jos_twitters.link from jos_twitters where cat=10
160 (32.186508178711): select jos_facebook.link from jos_facebook where cat=10
161 (38.14697265625): select jos_google_plus.link from jos_google_plus where cat=10
162 (41.961669921875): select jos_linkedin.link from jos_linkedin where cat=10
163 (247.00164794922): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1101.016998291): insert into jos_banners_delta values (14615,'2025-06-26 16:39:44','216.73.216.249','view'),(14202,'2025-06-26 16:39:44','216.73.216.249','view'),(14203,'2025-06-26 16:39:44','216.73.216.249','view')