A method of receiving a plurality of data streams at an electromagnetic field receiver in a wireless telecommunications network , wherein the electromagnetic field receiver comprises a first optical transmitter , a second optical transmitter , a first transmission medium , a second transmission medium , a first photodetector and a second photodetector , the first and second transmission media being spatially distinct, wherein the first optical transmitter is configured to transmit a first probe signal to the first photodetector through the first transmission medium at a first probe frequency and further configured to transmit a second probe signal to the second photodetector through the second transmission medium at a second probe frequency, and the second optical transmitter is configured to transmit a first coupling signal through the first transmission medium at a first coupling frequency and further configured to transmit a second coupling signal through the second transmission medium at a second coupling frequency, wherein the first probe frequency and first coupling frequency are set to excite electrons of the first transmission medium to a first predetermined Rydberg state so as to induce an Electromagnetic Induced Transparency, EIT, effect in the first transmission medium such that an incident electromagnetic field at a first frequency at the first transmission medium causes a detectable change in the first probe signal at the first photodetector , wherein the second probe frequency and second coupling frequency are set to excite electrons of the second transmission medium to a second predetermined Rydberg state so as to induce an EIT effect in the second transmission medium such that an electromagnetic field at a second frequency incident at the second transmission medium causes a detectable change in the second probe signal at the second photodetector , wherein the plurality of data streams are time multiplexed in a first time frame comprising a plurality of timeslots, such that a first data stream is communicated in a first subset of the plurality of timeslots of the first time frame and a second data stream is communicated in a second subset of the plurality of timeslots of the first time frame, the method comprising the steps of: obtaining data indicating detection by the first photodetector , in the first probe signal, of a first electromagnetic field incident at the first transmission medium during a timeslot of the first subset of the plurality of timeslots; associating the detected first electromagnetic field with a first data stream of the plurality of data streams; obtaining data indicating detection by the second photodetector , in the second probe signal, of a second electromagnetic field incident at the second transmission medium during a timeslot of the second subset of the plurality of timeslots; and associating the detected second electromagnetic field with a second data stream of the plurality of data streams. obtaining data indicating detection by the first photodetector , in the first probe signal, of a first electromagnetic field incident at the first transmission medium during a timeslot of the first subset of the plurality of timeslots; associating the detected first electromagnetic field with a first data stream of the plurality of data streams; obtaining data indicating detection by the second photodetector , in the second probe signal, of a second electromagnetic field incident at the second transmission medium during a timeslot of the second subset of the plurality of timeslots; and associating the detected second electromagnetic field with a second data stream of the plurality of data streams. <EOS>