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SUMMARY:Quantum Information Processing with Superconducting Circuits -  Pr
 of. Andreas Wallraff\, ETH Zurich
DTSTART:20190201T150000Z
DTEND:20190201T160000Z
UID:TALK117838@talks.cam.ac.uk
CONTACT:Kayleigh Dunn
DESCRIPTION:Superconducting circuits are a prime contender for realizing u
 niversal quantum computation and solving noisy intermediate-scale quantum 
 (NISQ) problems on fault-tolerant or non-error-corrected quantum processor
 s\, respectively. In this talk\, I will present elements of an architectur
 e which allows for fast\, high-fidelity\, single shot qubit read-out [1]\,
  for unconditional reset [2]\, and can be multiplexed [3]. Integrating mul
 tiple qubits in a single device\, we evaluate performance metrics such as 
 the single and two-qubit gate fidelity and the qubit readout fidelity. We 
 also test the performance of the architecture in parity measurements with 
 real-time feedback\, which is a basic element of a error correcting code. 
 To provide a potential avenue for extending monolithic chip-based architec
 tures for quantum information processing\, we employ the circuit elements 
 of our architecture to implement a deterministic state transfer and entang
 lement generation protocol [1]. Our protocol is based on an all-microwave 
 process\, which entangles or transfers the state of a superconducting qubi
 t with a time-symmetric itinerant single photon exchanged between individu
 ally packaged chips connected by a transmission line. We transfer qubit st
 ates at rates of 50 kHz\, absorb photons at the receiving node with near u
 nit probability\, and achieve transfer process fidelities and on demand re
 mote entanglement state fidelities of about 80 %. We also show that time b
 in encoding can be used to further improve these quantum communication met
 rics [5]. Sharing information coherently between physically separated chip
 s in a network of quantum computing modules may be an essential element fo
 r realizing a viable extensible quantum information processing system.\n\n
 [1] T. Walter et al.\, Phys. Rev. Applied 7\, 054020 (2017)\n[2]P. Magnard
  et al.\, Phys. Rev. Lett. 121\, 060502 (2018) \n[3] J. Heinsoo et al.\, P
 hys. Rev. Applied 10\, 034040 (2018)\n[4]P. Kurpiers et al.\, Nature 558\,
  264-267 (2018)\n[5]P. Kurpiers et al.\, arXiv:1811.07604 (2018)\n\n 
LOCATION:Small lecture theatre* please note change of time and location
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