Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Akel Hashim, Ming Yuan, Pranav Gokhale, Larry Chen, Christian Juenger
| Summary:
Quantum entanglement is one of the primary features which distinguishes
quantum computers from classical computers. In gate-based quantum computing,
the creation of entangled states or the distribution of entanglement across a
quantum processor often requires circuit depths which grow with the number of
entangled qubits. However, in teleportation-based quantum computing, one can
deterministically generate entangled states with a circuit depth that is
constant in the number of qubits, provided that one has access to an entangled
resource state, the ability to perform mid-circuit measurements, and can
rapidly transmit classical information. In this work, aided by fast classical
FPGA-based control hardware with a feedback latency of only 150 ns, we explore
the utility of teleportation-based protocols for generating non-local,
multi-partite entanglement between superconducting qubits. First, we
demonstrate well-known protocols for generating Greenberger-Horne-Zeilinger
(GHZ) states and non-local CNOT gates in constant depth. Next, we utilize both
protocols for implementing an unbounded fan-out (i.e., controlled-NOT-NOT) gate
in constant depth between three non-local qubits. Finally, we demonstrate
deterministic state teleportation and entanglement swapping between qubits on
opposite side of our quantum processor.
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