Navigation Links
First tunable, 'noiseless' amplifier may boost quantum computing, communications
Date:10/15/2008

Researchers at the National Institute of Standards and Technology (NIST) and JILA, a joint institute of NIST and the University of Colorado (CU) at Boulder, have made the first tunable noiseless amplifier. By significantly reducing the uncertainty in delicate measurements of microwave signals, the new amplifier could boost the speed and precision of quantum computing and communications systems.

Conventional amplifiers add unwanted noise, or random fluctuations, when they measure and boost electromagnetic signals. Amplifiers that theoretically add no noise have been demonstrated before, but the JILA/NIST technology, described in an Oct. 5, 2008, advance online publication of Nature Physics,* offers better performance and is the first to be tunable, operating between 4 and 8 gigahertz, according to JILA group leader Konrad Lehnert. It is also the first amplifier of any type ever to boost signals sufficiently to overcome noise generated by the next amplifier in a series along a signal path, Lehnert says, a valuable feature for building practical systems.

Noisy amplifiers force researchers to make repeated measurements of, for example, the delicate quantum states of microwave fieldsthat is, the shape of the waves as measured in amplitude (or power) and phase (or point in time when each wave begins). The rules of quantum mechanics say that the noise in amplitude and phase cant both be zero, but the JILA/NIST amplifier exploits a loophole stipulating that if you measure and amplify only one of these parametersamplitude, in this casethen the amplifier is theoretically capable of adding no noise. In reality, the JILA/NIST amplifier adds about half the noise that would be expected from measuring both amplitude and phase.

The JILA/NIST amplifier could enable faster, more precise measurements in certain types of quantum computerswhich, if they can be built, could solve some problems considered intractable todayor quantum communications systems providing unbreakable encryption. It also offers the related and useful capability to squeeze microwave fields, trading reduced noise in the signal phase for increased noise in the signal amplitude. By combining two squeezed entities, scientists can entangle them, linking their properties in predictable ways that are useful in quantum computing and communications. Entanglement of microwave signals, as opposed to optical signals, offer some practical advantages in computing and communication such as relatively simple equipment requirements, Lehnert says.

The new amplifier is a 5-millimeter-long niobium cavity lined with 480 magnetic sensors called SQUIDs (superconducting quantum interference devices). The line of SQUIDs acts like a metamaterial, a structure not found in nature that has strange effects on electromagnetic energy. Microwaves ricochet back and forth inside the cavity like a skateboarder on a ramp. Scientists tune the wave velocity by manipulating the magnetic fields in the SQUIDs and the intensity of the microwaves. An injection of an intense pump tone at a particular frequency, like a skateboarder jumping at particular times to boost speed and height on a ramp, causes the microwave power to oscillate at twice the pump frequency. Only the portion of the signal which is synchronous with the pump is amplified.


'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Reclast(R) Receives US FDA Approval as First and Only Once-Yearly Treatment for Women With Postmenopausal Osteoporosis
2. GlaxoSmithKline Recognizes University of Michigans Dr. Daniel F. Hayes as the First Recipient of the Gianni Bonadonna Breast Cancer Award
3. Kewaunee Scientific Announces First Quarter Results and Quarterly Dividend
4. Genmab Announces 2007 First Half Year Results
5. Pharsight Achieves First License Sale for Public-Source Database
6. Novare Announces First Ever Single Port Laparoscopic Kidney Removal (Nephrectomy) Using RealHand(TM) HD Instruments
7. ExonHit Therapeutics: Allergan and ExonHits First Collaboration Compound to Begin Human Clinical Trials
8. China Medical Technologies Reports First Quarter Financial Results
9. Pressure BioSciences, Inc. Issued First Patent in Canada
10. Peregrine Pharmaceuticals to Announce First Quarter FY 2008 Financial Results
11. Exelixis Reports Encouraging Interim Data From a Phase 2 Trial of XL647 as First-Line Therapy for Non-Small Cell Lung Cancer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
First tunable, 'noiseless' amplifier may boost quantum computing, communications
(Date:2/8/2016)... Feb. 8, 2016  CytRx Corporation (NASDAQ: ... specializing in oncology, today announced that it has ... with Hercules Technology Growth Capital, Inc. and Hercules ... in financing. --> ... million of financing under the loan and security ...
(Date:2/8/2016)... Novan, Inc. today announced that Director Robert A. Ingram ... In addition, Robert Keegan has been appointed to the ... --> North Carolina . ... of $32.8 million of net proceeds in a private Mezzanine B ... the Research Triangle area of North Carolina . ...
(Date:2/8/2016)... 2016  BioElectronics Corporation (OTC Pink: BIEL), the ... that it is responding to a notice of ... and Exchange Commission posted on the agency website.  ... the Board of BioElectronics Corporation and the Edward ... The Fuqua School of Business, Duke University.   ...
(Date:2/8/2016)... ... February 08, 2016 , ... Bulk food product ... foods at various stages of the production process. Despite frequently inspecting loose product ... products post packaging such as sacks of dry powders. , Mettler-Toledo Product Inspection's ...
Breaking Biology Technology:
(Date:2/3/2016)... Calif. , Feb. 3, 2016 Vigilant ... Police Department in Missouri ... license plate reader (LPR) data from Vigilant Solutions. ... hit-and-run case in which the victim was walking out of a convenience ... parking space next to his vehicle, striking his vehicle ...
(Date:2/2/2016)... Feb. 2, 2016 Checkpoint Inhibitors for ... Market Are you interested in the future ... for checkpoint inhibitors. Visiongain,s report gives those predictions ... and national level. Avoid falling behind in ... opportunities and revenues those emerging cancer therapies can ...
(Date:2/1/2016)... 1, 2016 Rising sales of ... global touchfree intuitive gesture control market size ... sales of consumer electronics coupled with new technological advancements ... size through 2020   --> ... new technological advancements to drive global touchfree intuitive gesture ...
Breaking Biology News(10 mins):