TY - JOUR
T1 - Quantum-Limited Directional Amplifiers with Optomechanics
AU - Malz, Daniel
AU - Tóth, László D.
AU - Bernier, Nathan R.
AU - Feofanov, Alexey K.
AU - Kippenberg, Tobias J.
AU - Nunnenkamp, Andreas
N1 - Funding Information:
We are grateful to John Teufel and, in particular, Anja Metelmann for insightful discussions and helpful comments. D.\u2009M. acknowledges support by the UK Engineering and Physical Sciences Research Council (EPSRC) under Grant No. EP/M506485/1. This work was supported by the SNF, the NCCR Quantum Science and Technology (QSIT), and the European Union\u2019s Horizon 2020 research and innovation programme under Grant No. 732894 (FET Proactive HOT). T.\u2009J.\u2009K. acknowledges financial support from an ERC Advanced Grant (QuREM). A.\u2009N. received support from a University Research Fellowship from the Royal Society and acknowledges support from the Winton Programme for the Physics of Sustainability.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/1/8
Y1 - 2018/1/8
N2 - Directional amplifiers are an important resource in quantum-information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators; we discuss how this noise can be suppressed, a crucial aspect for technological applications. The isolation bandwidth in both is of the order of the mechanical linewidth divided by the amplitude gain. We derive the bandwidth and gain-bandwidth product for both and find that the phase-sensitive amplifier has an unlimited gain-bandwidth product. Our study represents an important step toward flexible, on-chip integrated nonreciprocal amplifiers of microwave signals.
AB - Directional amplifiers are an important resource in quantum-information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators; we discuss how this noise can be suppressed, a crucial aspect for technological applications. The isolation bandwidth in both is of the order of the mechanical linewidth divided by the amplitude gain. We derive the bandwidth and gain-bandwidth product for both and find that the phase-sensitive amplifier has an unlimited gain-bandwidth product. Our study represents an important step toward flexible, on-chip integrated nonreciprocal amplifiers of microwave signals.
UR - http://www.scopus.com/inward/record.url?scp=85040450845&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.023601
DO - 10.1103/PhysRevLett.120.023601
M3 - Journal article
C2 - 29376677
AN - SCOPUS:85040450845
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 2
M1 - 023601
ER -