Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits

Chapman, Benjamin J.; Rosenthal, Eric I.; Kerckhoff, Joseph; Moores, Bradley A.; Vale, Leila R.; Mates, J. A. B.; Hilton, G. C.; Lalumière, Kevin; Blais, Alexandre; Lehnert, K. W.

doi:10.1103/physrevx.7.041043

Cited by 126 publications

(86 citation statements)

References 53 publications

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“…To reduce the losses below 1 dB, more radical setup changes would probably be needed, such as integrating the squeezer, the circulator, the ESR resonator, and the amplifier on a single chip. While such a complex quantum integrated circuit has never been achieved so far, promising steps in that direction have already been taken, with, in particular, several recent demonstrations of on-chip superconducting circulators [44][45][46][47].…”

Section: A Applicability Of the Schemementioning

confidence: 99%

Magnetic Resonance with Squeezed Microwaves

et al. 2017

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Vacuum fluctuations of the electromagnetic field set a fundamental limit to the sensitivity of a variety of measurements, including magnetic resonance spectroscopy. We report the use of squeezed microwave fields, which are engineered quantum states of light for which fluctuations in one field quadrature are reduced below the vacuum level, to enhance the detection sensitivity of an ensemble of electronic spins at millikelvin temperatures. By shining a squeezed vacuum state on the input port of a microwave resonator containing the spins, we obtain a 1.2-dB noise reduction at the spectrometer output compared to the case of a vacuum input. This result constitutes a proof of principle of the application of quantum metrology to magnetic resonance spectroscopy.

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Section: A Applicability Of the Schemementioning

confidence: 99%

Magnetic Resonance with Squeezed Microwaves

et al. 2017

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“…To address this challenge, several approaches were proposed in recent years. Most strategies require active devices [7][8][9][10][11][12][13][14][15][16], where reciprocity is broken by the interplay of several pump fields with precise phase relations, at the cost of adding energy to the system. On the other hand, passive devices have also been proposed based on superconducting junction rings, where circulation is obtained using a constant flux bias; these are however highly sensitive to charge noise [17,18].…”

Section: Introductionmentioning

confidence: 99%

A unidirectional on-chip photonic interface for superconducting circuits

et al. 2020

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We propose and analyze a passive architecture for realizing on-chip, scalable cascaded quantum devices. In contrast to standard approaches, our scheme does not rely on breaking Lorentz reciprocity. Rather, we engineer the interplay between pairs of superconducting transmon qubits and a microwave transmission line, in such a way that two delocalized orthogonal excitations emit (and absorb) photons propagating in opposite directions. We show how such cascaded quantum devices can be exploited to passively probe and measure complex many-body operators on quantum registers of stationary qubits, thus enabling the heralded transfer of quantum states between distant qubits, as well as the generation and manipulation of stabilizer codes for quantum error correction.

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“…The main question is how this chiral interaction affects the spin transport properties of the Y junction. More specifically, our goal is to identify an interaction regime in which a Y junction made of long chains can redirect spin currents in a clockwise or counter-clockwise manner, in analogy with quantum circulators that have been realized in photonic and superconducting circuits [34,35,36].…”

Section: Introductionmentioning

confidence: 99%

Chiral Y junction of quantum spin chains

et al. 2019

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We study a Y junction of spin-1/2 Heisenberg chains with an interaction that breaks both time-reversal and chain exchange symmetries, but not their product nor SU(2) symmetry. The boundary phase diagram features a stable disconnected fixed point at weak coupling and a stable three-channel Kondo fixed point at strong coupling, separated by an unstable chiral fixed point at intermediate coupling. Using non-abelian bosonization and boundary conformal field theory, together with density matrix renormalization group and quantum Monte Carlo simulations, we characterize the signatures of these low-energy fixed points. In particular, we address the boundary entropy, the spin conductance, and the temperature dependence of the scalar spin chirality and the magnetic susceptibility at the boundary. h B n d Q h w Z Q E P A M r / D m P D o v z r v z M W 8 t O P n M I f y B 8 / k D h C + P n A = = < / l a t e x i t > J < l a t e x i t s h a 1 _ b a s e 6 4 = " 1 I Z Z 6 U M H d 4 D 0 X 9 s v v f d t 9 + 0 / G f o = " > A A A B 7 X i c d V D L S s N A F J 3 U V 6 2 v q k s 3 g 0 V w F Z I Y 2 r o r u h F X F e w D 2 l A m 0 0 k 7 d j I T Z i Z C C f 0 H N y 4 U c e v / u P N v n L Q V V P T A h c M 5 9 3 L v P W H C q N K O 8 2 E V V l b X 1 j e K m 6 W t 7 Z 3 d v f L + Q V u J V G L S w o I J 2 Q 2 R I o x y 0 t J U M 9 J N J E F x y E g n n F z m f u e e S E U F v 9 X T h A Q x G n E a U Y y 0 k d r X g z 4 e 0 0 G 5 4 t j n 9 a r n V 6 F j O 0 7 N 9 d y c e D X / z I e u U X J U w B L N Q f m 9 P x Q 4 j Q n X m C G l e q 6 T 6 C B D U l P M y K z U T x V J E J 6 g E e k Z y l F M V J D N r 5 3 B E 6 M M Y S S k K a 7 h X P 0 + k a F Y q W k c m s 4 Y 6 b H 6 7 e X i X 1 4 v 1 V E 9 y C h P U k 0 4 X i y K U g a 1 g P n r c E g l w Z p N D U F Y U n M r x G M k E d Y m o J I J 4 e t T + D 9 p e 7 b r 2 O 6 N X 2 l c L O M o g i N w D E 6 B C 2 q g A a 5 A E 7 Q A B n f g A T y B Z 0 t Y j 9 a L 9 b p o L V j L m U P w A 9 b b J 6 z A j z E = < / l a t e x i t > < l a t e x i t s h a 1 _ b a s e 6 4 = " 1 I Z Z 6 U M H d 4 D 0 X 9 s v v f d t 9 + 0 / G f o = " > A A A B 7 X i c d V D L S s N A F J 3 U V 6 2 v q k s 3 g 0 V w F Z I Y 2 r o r u h F X F e w D 2 l A m 0 0 k 7 d j I T Z i Z C C f 0 H N y 4 U c e v / u P N v n L Q V V P T A h c M 5 9 3 L v P W H C q N K O 8 2 E V V l b X 1 j e K m 6 W t 7 Z 3 d v f L + Q V u J V G L S w o I J 2 Q 2 R I o x y 0 t J U M 9 J N J E F x y E g n n F z m f u e e S E U F v 9 X T h A Q x G n E a U Y y 0 k d r X g z 4 e 0 0 G 5 4 t j n 9 a r n V 6 F j O 0 7 N 9 d y c e D X / z I e u U X J U w B L N Q f m 9 P x Q 4 j Q n X m C G l e q 6 T 6 C B D U l P M y K z U T x V J E J 6 g E e k Z y l F M V J D N r 5 3 B E 6 M M Y S S k K a 7 h X P 0 + k a F Y q W k c m s 4 Y 6 b H 6 7 e X i X 1 4 v 1 V E 9 y C h P U k 0 4 X i y K U g a 1 g P n r c E g l w Z p N D U F Y U n M r x G M k E d Y m o J I J 4 e t T + D 9 p e 7 b r 2 O 6 N X 2 l c L O M o g i N w D E 6 B C 2 q g A a 5 A E 7 Q A B n f g A T y B Z 0 t Y j 9 a L 9 b p o L V j L m U P w A 9 b b J 6 z A j z E = < / l a t e x i t > < l a t e x i t s ...

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Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits

Cited by 126 publications

References 53 publications

Magnetic Resonance with Squeezed Microwaves

Magnetic Resonance with Squeezed Microwaves

A unidirectional on-chip photonic interface for superconducting circuits

Chiral Y junction of quantum spin chains

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