Charlie does not let Lisa near those scary ultra loud crinkly biodegradeable Sun Chips bags.

Stories
The Short Weird Life -- and Potential Afterlife -- of Quantum Radar
from the visionary-scheme dept.
sciencehabit writes:
A mini-arms race is unfolding in the supposed field of quantum radar, spurred by press reports in 2016 that China had built one -- potentially threatening the ability of stealthy military aircraft to hide from conventional radars. Governments around the world have tasked physicists to look into the idea. Whereas a conventional radar searches for objects by detecting pulse of microwaves reflected from them, quantum radar would utilize pulses of microwaves linked by a quantum connection called entanglement. The system would retain one pulse and measure it in concert with the one reflected from the object. Correlations between the two would make it easier to spot an object through the glare of the surroundings. Or so researchers hoped. Groups have demonstrated elements of a quantum radar, but only in limited experiments that a nonquantum system can still match. And fundamental physical limits suggest the scheme can't beat ordinary radar for long-range detection. Even one of the inventors of the basic concept thinks it won't work when applied to radar.
Posted by BeauHD 2 hours ago
physics science technology communications quantum
Close Ad
9 Comments
Help
All
Outstanding
Funny
Aren't radars already quantum? (+1)
RightwingNutjob 2 hours ago
Since all the outgoing photons are coherent and the return is detected by direct measurement of the E field?
Reply  Share
 Flag
Re: Aren't radars already quantum? (+1)
mykepredko an hour ago
Why are you saying that they're "coherent"? They're in phase with the same polarization but I can't see how you can call them coherent.
Reply  Share
 Flag
Re: Aren't radars already quantum? (+1)
K. S. Kyosuke an hour ago
They're in phase with the same polarization
Isn't that the definition of coherence?
Reply  Share
 Flag
Re: Aren't radars already quantum? (+1)
BeauHD (.) (349) 6 minutes ago
COHERENT: the quality of being logical and consistent.
"this raises further questions on the coherence of state policy"
synonyms: consistency logicality good sense soundness organization orderliness unity clarity articulacy intelligibility comprehensibility

Pretty EZ to just google it, but that's just my opinion..

S beauhd E
E beauhd D
N BeauHD I
I BeauHD T
O beauhd O
R beauhd R
Reply  Share
 Flag
Re: Aren't radars already quantum? (+1)
Type44Q 27 minutes ago
Since all the outgoing photons are coherent...
Not unless it's a maser.
Reply  Share
 Flag
Obligatory Ant Man and the Wasp Quote (+1)
mykepredko an hour ago
"Do you guys just put the word 'quantum' in front of everything?"
Reply  Share
 Flag
Re: Obligatory Ant Man and the Wasp Quote (+1)
zenlessyank an hour ago
Well, to be fair, those of us in the know see the word 'quantum' as a replacement for the words 'snake oil'.
Reply  Share
 Flag
Re: Obligatory Ant Man and the Wasp Quote (+1)
Malays2 bowman a few seconds ago
"Well, to be fair, those of us in the know see the word 'quantum' as a replacement for the words 'snake oil'."
My thoughts upon seeing "Quantum radar" were that these guys are kooks and they have been doing too many drugs.
Seriously and 100% honest, that was the very first thought that came to mind.
Reply  Share
 Flag
Does nothing against stealth, helps with jamming (+4, Informative)
Carrier Lifetime an hour ago
Stealth works by reflecting incoming photons away the transmitter, entangled or not. If you do not detect any photons, you don't get measure entanglement. What helps against stealth is multi-static radars, where the transmitter is not colocated with the receiver.
What quantum entanglement helps against is jamming.
Reply  Share
 Flag
You fail 17?! 
Anonymous Coward 36 minutes ago
First, 1You have to
Reply  Share
 Flag
by TaboolaSponsored LinksYou May Like
Psoriatic Arthritis Signs - You May Wish You Knew Them Sooner
Psoriatic Arthritis | Search Ads
Lung Cancer Signals Many May Wish They Noticed Earlier
Lung Cancer | Search Ads
Stop What You're Doing and Look at These Animal Photos
The Dodo
Celebrities Who Fans Adored, Before Surgery
mindyourdollars.com
Submit Terms Privacy Feedback Non-mobile
follow us
 Copyright © 2020 SlashdotMedia.All Rights Reserved.
×
Exercise Your Consumer Rights

Do Not Sell My Information
Opt out of campaigns and programs that require the sale or disclosure of information to our partners. View our Privacy Policy.
Submit Request
Opt Out of Targeted Advertising
Turn off online tracking by opting out of cookies and the transfer of data to third parties.
Submit Request
Exercise your consumer rights via other methods including: 
By e-mail: [email protected]
By phone: 1-800-552-9000
Or by mail at: 
Slashdot Media
PO Box 2452 
La Jolla, CA 92038
Attention: Privacy Compliance

Tesla Files Lawsuit Demanding Reopening of Plant As Musk Faces Criticism
Degrees From Home: Earn A Healthcare Degree Remotely
Online Education | Search Ads
|
Sponsored
Southern Phrases Northerners Don't Understand
Trend Chaser
|
Sponsored