Integrating superconducting qubit systems for improved quantum operations
ORAL
Abstract
Recent progress in the field of superconducting circuits has led to qubit coherence times exceeding by far typical single and two-qubit gate times. In this regime, in which relaxation (T$_1$) and dephasing (T$_2$) times are above 40 and 50 microseconds, respectively, quantum gates are not limited by intrinsic noise sources. We enter this regime by optimizing the design of coplanar transmon qubits to reduce the influence of surface loss. Furthermore, we have eliminated spurious microwave resonances which we can detect by monitoring the qubit coherence while sweeping the frequency of an external microwave drive applied to the system. To improve T$_2$ times, we minimize dephasing caused by thermal photons in coupled resonator modes by increasing the attenuation of the readout drive lines. To maintain the ability to drive fast gates with strong microwave signals while preserving coherence, we employ weakly capacitively coupled control lines providing independent control of the qubits and allowing for improved two-qubit entangling gate operations.
*We acknowledge support from ARO under contract W911NF-14-1-0124.
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Authors
S. Filipp
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T J Watson Research Center
Sarah Sheldon
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T.J. Watson Research Center, Yorktown Heights, NY, USA
Easwar Magesan
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T J Watson Res Ctr
IBM T.J. Watson Research Center
L. S. Bishop
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T J Watson Research Center
Matthias Steffen
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T J Watson Res Ctr
IBM T.J. Watson Research Center
IBM
Jerry Chow
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T J Watson Res Ctr
IBM T.J. Watson Research Center
Jay Gambetta
IBM TJ Watson Research Center, Yorktown Heights, NY, USA
IBM TJ Watson Research Center
IBM TJ Watson Research Center, Yorktown Heights NY, USA
IBM T.J. Watson Research Center, Yorktown Heights, NY 10598, USA
