Engineering of heralded narrowband color-entangled states

Abstract

Efficient heralded generation of entanglement together with its manipulation is of great importance for quantum communications. In addition, states generated with bandwidths naturally compatible with atomic transitions allow a more efficient mapping of light into matter which is an essential requirement for long distance quantum communications. Here we propose a scheme where the indistinguishability between two spontaneous four-wave mixing processes is engineered to herald generation of single-photon frequency-bin entangled states, i.e. single-photons shared by two distinct frequency modes. We show that entanglement can be optimised together with the generation probability, while maintaining absorption negligible. Besides, the scheme illustrated for cold rubidium atoms is versatile and can be implemented in several other physical systems.t e x i t s h a 1 _ b a s e 6 4 = " n V q k N v e t 0 T l j / 7 a y O X i 1 8 h + 5 h M M = " > A A A B + 3 i c d V D L S g M x F M 3 4 r P U 1 2 q W b Y B F c D V M R H 7 u i G 5 c V H F t o x y G T Z t r Q P I Y k I w x D / R U 3 L l T c + i P u / B s z b Q W f B 0 I O 5 9 x 7 c 3 P i l F F t f P / d m Z t f W F x a r q x U V 9 f W N z b d r e 1 r L T O F S Y A l k 6 o T I 0 0 Y F S Q w 1 D D S S R V B P G a k H Y / O S 7 9 9 S 5 S m U l y Z P C U h R w N B E 4 q R s V L k 1 n q S k w G K C q R v e q m i n I y r k V v 3 v S O / B P x N G t 7 k 9 u t g h l b k v v X 6 E m e c C I M Z 0 r r b 8 F M T F k g Z i p k d 2 M s 0 S R E e o Q H p W i o Q J z o s J s u P 4 Z 5 V + j C R y h 5 h 4 E T 9 2 l E g r n X O Y 1 v J k R n q n 1 4 p / u V 1 M 5 O c h A U V a W a I w N O H k o x B I 2 G Z B O x T R b B h u S U I K 2 p 3 h X i I F M L G 5 l W G 8 P l T + D 8 J D r x T z 7 8 8 r D f P Z m l U w A 7 Y B f u g A Y 5 B E 1 y A F g g A B j m 4 B 4 / g y b l z H p x n 5 2 V a O u f M e m r g G 5 z X D 1 A f l L 8 = < / l a t e x i t > < l a t e x i t s h a 1 _ b a s e 6 4 = " n V q k N v e t 0 T l j / 7 a y O X i 1 8 h + 5 h M M = " > A A A B + 3 i c d V D L S g M x F M 3 4 r P U 1 2 q W b Y B F c D V M R H 7 u i G 5 c V H F t o x y G T Z t r Q P I Y k I w x D / R U 3 L l T c + i P u / B s z b Q W f B 0 I O 5 9 x 7 c 3 P i l F F t f P / d m Z t f W F x a r q x U V 9 f W N z b d r e 1 r L T O F S Y A l k 6 o T I 0 0 Y F S Q w 1 D D S S R V B P G a k H Y / O S 7 9 9 S 5 S m U l y Z P C U h R w N B E 4 q R s V L k 1 n q S k w G K C q R v e q m i n I y r k V v 3 v S O / B P x N G t 7 k 9 u t g h l b k v v X 6 E m e c C I M Z 0 r r b 8 F M T F k g Z i p k d 2 M s 0 S R E e o Q H p W i o Q J z o s J s u P 4 Z 5 V + j C R y h 5 h 4 E T 9 2 l E g r n X O Y 1 v J k R n q n 1 4 p / u V 1 M 5 O c h A U V a W a I w N O H k o x B I 2 G Z B O x T R b B h u S U I K 2 p 3 h X i I F M L G 5 l W G 8 P l T + D 8 J D r x T z 7 8 8 r D f P Z m l U w A 7 Y B f u g A Y 5 B E 1 y A F g g A B j m 4 B 4 / g y b l z H p x n 5 2 V a O u f M e m r g G 5 z X D 1 A f l L 8 = < / l a t e x i t > < l a t e x i t s h a 1 _ b a s e 6 4 = " n V q k N v e t 0 T l j / 7 a y O X i 1 8 h + 5 h M M = " > A A A B + 3 i c d V D ...

Roadmap on quantum light spectroscopy

“…The authors are grateful to all the co-authors of papers [15,16,21,30] for fruitful and pleasant collaborations.…”

“…On the theoretical side, one should keep searching for novel methods of generating and manipulating non-classical and entangled states over multiple spectrotemporal modes [30]. At the same time, another hard task one should face is the development of new tools for analyzing such complex quantum states spanning multiple modes.…”