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Abstract
We propose and experimentally demonstrate an efficient scheme for bidirectional and deterministic photonic communication between two remote superconducting modules. The two chips, each consists of a transmon, are connected through a one-meter long coaxial cable that is coupled to a dedicated “communication” resonator on each chip. The two communication resonators hybridize with a mode of the cable to form a dark “communication mode” that is highly immune to decay in the coaxial cable. We overcome the various restrictions of quantum communication channels established by other recent approaches in deterministic communication for superconducting qubits. Our approach enables bidirectional communication, and eliminates the high insertion loss and large volume footprint of circulators. We modulate the transmon frequency via a parametric drive to generate sideband interactions between the transmon and the communication mode. We demonstrate bidirectional single-photon transfer with a success probability exceeding 60%, and generate an entangled Bell pair with a fidelity of 79.3 ± 0.3%.
Highlights
A practical quantum computer requires a large number of qubits working in cooperation,[1] a challenging task for any quantum hardware platform
A deterministic quantum communication channel is advantageous over a probabilistic one because it lowers the threshold requirement for fault-tolerant quantum computation and can achieve higher entanglement rates.[15]
Realizing deterministic photonic communication requires releasing a single photon from one qubit and catching it with the remote qubit
Summary
A practical quantum computer requires a large number of qubits working in cooperation,[1] a challenging task for any quantum hardware platform. Static coupling limits the maximum transfer fidelity to only 54%.16,17 This limit is exceeded by dynamically tailoring the emission and absorption profiles.[18,19,20,21] These capabilities are presently being used to perform photonic communication between superconducting qubits connected by a transmission line within a cryostat.[14,22,23,24] In these experiments, the use of a circulator enables the finite-length transmission line to be modeled as a long line with a continuum density of states, at the cost of added transmission loss.
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