A phase sensitive SIS mixer to circumvent the quantum limit

Conference · Fri Mar 01 04:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6088639

Bocko, M F; Zhang, Z; Martinet, S ^[1]; Cromar, M W ^[2]

---

1. Rochester Univ., NY (United States). Dept. of Electrical Engineering
2. National Inst. of Standards and Technology, Boulder, CO (United States)

This paper reports on a conventional SIS mixer, which is pumped by a single frequency local oscillator (LO) functions as a phase-insensitive linear amplifier and may achieve a noise level near the quantum limit of one-half photon added noise per unit bandwidth. A phase sensitive linear amplifier may have less noise than this quantum limit. The authors attempt to beat the quantum noise limit with an SIS mixer by employing a two-LO technique which makes the mixer's gain dependent upon the phase of the incoming signal The authors experimentally demonstrated the phase sensitive gain of our two-LO mixer, the gain variation from maximum to minimum is more than 20 dB. The authors also present theoretical predictions of the noise of the two-LO mixer.

• OSTI ID: 6088639
• Report Number(s): CONF-900944--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

661100 -- Classical & Quantum Mechanics-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
665412* -- Superconducting Devices-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLIFICATION
AMPLIFIERS
CALCULATION METHODS
ELECTRONIC EQUIPMENT
EQUIPMENT
GAIN
JUNCTIONS
MECHANICS
NOISE
OSCILLATORS
QUANTUM MECHANICS
SUPERCONDUCTING JUNCTIONS