On-demand quantum state transfer and entanglement between remote microwave cavity memories

By C. Axline, Luke D. Burkhart, Wolfgang Pfaff, Mengzhen Zhang, K. Chou, P. Campagne-Ibarcq, P. Reinhold, Luigi Frunzio, Steven M. Girvin, Liang Jiang and 2 more. Nature Physics, 2017

243 citations recorded by the source corpus.

Coupling isolated quantum systems through propagating photons is a central theme in quantum science1,2, with the potential for groundbreaking applications such as distributed, fault-tolerant quantum computing3–5. To date, photons have been used widely to realize high-fidelity remote entanglement6–12 and state transfer13–15 by compensating for inefficiency with conditioning, a fundamentally probabilistic strategy that places limits on the rate of communication. In contrast, here we experimentally realize a long-standing proposal for deterministic, direct quantum state transfer16. Using efficient, parametrically controlled emission and absorption of microwave photons, we show on-demand, high-fidelity state transfer and entanglement between two isolated superconducting cavity quantum memories. The transfer rate is faster than the rate of photon loss in either memory, an essential requirement for complex networks. By transferring states in a multiphoton encoding, we further show that the use of cavity memories and state-independent transfer creates the striking opportunity to deterministically mitigate transmission loss with quantum error correction. Our results establish a compelling approach for deterministic quantum communication across networks, and will enable modular scaling of superconducting quantum circuits. Sending quantum states as shaped microwave photonic wavepackets realizes on-demand, high-fidelity quantum state transfer and entanglement between two superconducting cavity quantum memories.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/9d1a9ec1b021471037692985d35f956dfb71ba9d

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Citations in the corpus

Quantum information processing and quantum optics with circuit quantum electrodynamics (2020, background): “Such brute-force approaches are viable up to around 1,000 qubits — a loose estimate — limited primarily by packaging, signal routing and the size of dilution refrig-a”
Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, background): “In superconducting circuits, it is possible to create very strong coupling between the transmitting and receiving qubits with a microwave photon in a transmission line connecting the two modules and featuring negligible loss over the short communication distances involved [13]–[16].”
Circuit quantum electrodynamics (2020, methodology): “The experiments of Axline et al. (2018) and Campagne-Ibarcq et al. (2018) reported similar Bell-state fidelities using different approaches to prepare time-symmetric propagating photons (Pfaff et al., 2017).”
A Game of Surface Codes: Large-Scale Quantum Computing with Lattice Surgery (2018, background): “It is also a prescription to linearly speed up the quantum computer down to the time-optimal limit. between diﬀerent superconducting chips [39–41].”
Fast universal control of an oscillator with weak dispersive coupling to a qubit (2021, methodology): “For the binomial code, previous experiments have demonstrated logical state preparation using GRAPE, relying on a large coupling χ/2π compared to decoherence rates [2, 6, 12, 13, 37].”